|**Summary of Significant Accounting Policies**                 | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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|**Accounting Policies [Abstract]**                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Summary of Significant Accounting Policies                     | Summary of Significant Accounting PoliciesBasis of PresentationThe Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries.  Collectively, CNAF and its subsidiaries are referred to as CNA or the Company.  Loews Corporation (Loews) owned approximately89%of the outstanding common stock of CNAF as ofDecember 31, 2019.The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP).  Intercompany amounts have been eliminated.  The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period.  Actual results may differ from those estimates.Recently Adopted Accounting Standards Updates (ASU)ASU 2016-02:In February 2016, the Financial Accounting Standards Board (FASB) issued ASU No. 2016-02,Leases (Topic 842): Accounting for Leases.The updated accounting guidance requires lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by the majority of leases, including those historically accounted for as operating leases.  On January 1, 2019, the Company adopted the updated guidance using a modified retrospective method.  Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.  The Company utilized the permitted package of practical expedients allowing the Company to not reassess whether a contract is or contains a lease, lease classification and initial direct costs.  The Company also utilized the permitted practical expedient to not separate lease and non-lease components for all leases.Adoption of the updated guidance resulted in the following changes to the Consolidated Balance Sheets on January 1, 2019:(In millions)Balance as of December 31, 2018Adjustments Due to Adoption of Topic 842Balance as of January 1, 2019Property and equipment at cost (less accumulated depreciation)$324$2$326Other assets1,2082371,445Other liabilities3,0892393,328As ofJanuary 1, 2019, operating lease right-of-use (ROU) assets, included within Other assets, were reduced by accrued rent and lease incentives of$75 millionpreviously classified as Other liabilities.  The updated guidance did not impact the Consolidated Statements of Operations.  See NoteLto the Consolidated Financial Statements for additional information regarding leases.ASU 2014-09:In May 2014, the FASB issued ASU No. 2014-09,Revenue Recognition (Topic 606):Revenue from Contracts with Customers.  The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance, but the standard does apply to certain of the Company's warranty products and services.  The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services.On January 1, 2018, the Company adopted the updated guidance using the modified retrospective method applied to all contracts which were not completed as of the date of adoption, with the cumulative effect recognized as an adjustment to the opening balance of Retained earnings.  Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.Under the new guidance, revenue on warranty products and services is recognized more slowly as compared to the historic revenue recognition pattern.  In addition, for warranty products where the Company acts as the principal in the transaction, Non-insurance warranty revenue and Non-insurance warranty expense are increased to reflect the gross amount paid by consumers, including the retail seller’s markup which is considered a commission to the Company's agent.  This gross-up of revenue and expense also resulted in an increase to Deferred non-insurance warranty acquisition expense and Deferred non-insurance warranty revenue on the Company's Consolidated Balance Sheets as the revenue and expense are recognized over the actuarially determined expected claims emergence pattern.The cumulative effect changes to the Consolidated Balance Sheet for the adoption of the updated guidance on January 1, 2018 were as follows:(In millions)Balance as of December 31, 2017Adjustments Due to Adoption of Topic 606Balance as of January 1, 2018Deferred non-insurance warranty acquisition expense$212$1,882$2,094Deferred non-insurance warranty revenue9721,9692,941Deferred income taxes13721158Retained earnings9,414(66)9,348The impact of adoption on the Consolidated Statements of Operations and Balance Sheet was as follows:Year ended December 31, 2018Prior to AdoptionEffect of AdoptionAs Reported(In millions)Statement of operations:Non-insurance warranty revenue$420$587$1,007Total revenues9,54758710,134Non-insurance warranty expense328595923Total claims, benefits and expenses8,5755959,170Income before income tax972(8)964Income tax expense(153)2(151)Net income819(6)813Balance sheet(1)at December 31, 2018:Deferred non-insurance warranty acquisition expense$2,116$397$2,513Deferred non-insurance warranty revenue2,9974053,402Deferred income taxes3902392Retained earnings9,283(6)9,277(1)The Prior to Adoption amounts presented in this table include the cumulative effect adjustment at adoption presented in the prior table.See Note R to the Consolidated Financial Statements for additional information regarding non-insurance revenues from contracts with customers.ASU 2016-01:In January 2016, the FASB issued ASU No. 2016-01,Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.  The updated accounting guidance requires changes to the reporting model for financial instruments.  The guidance primarily changes the model for equity securities by requiring changes in the fair value of equity securities (except those accounted for under the equity method of accounting, those without readily determinable fair values and those that result in consolidation of the investee) to be recognized through the income statement.The Company adopted the updated guidance on January 1, 2018 and recognized a cumulative effect adjustment that increased beginning Retained earnings by$28 million, net of tax.  Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.For the year ended December 31, 2017, there was a$32 millionincrease in the fair value of non-redeemable preferred stock and a less than$1 millionincrease in the fair value of common stock, both recognized in Other comprehensive income.Accounting Standards Pending AdoptionIn June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326):Measurement of Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through the Company’s results of operations. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected and applies to the mortgage loan portfolio, reinsurance and insurance receivables and other financing receivables. Under the new guidance, the Other-than-temporary impairment (OTTI) concept has been eliminated for available-for-sale fixed maturity securities, and expected credit losses are recognized immediately in earnings through an allowance, rather than as a reduction of amortized cost. This will allow the Company to record reversals of credit losses if the estimate of credit losses declines. For available-for-sale fixed maturity securities with an intent to sell, impairment will continue to result in a write-down of amortized cost. The guidance is effective for interim and annual periods beginning after December 15, 2019. The expected credit loss model will be applied using a modified retrospective approach with the cumulative effect recognized as an adjustment to retained earnings. A prospective transition approach is required for available-for-sale debt securities that were purchased with credit deterioration or have recognized an OTTI write-down prior to the effective date.  The Company has evaluated the effect the guidance will have on its financial statements and determined that the impact at the date of adoption will not be material.In August 2018, the FASB issued ASU 2018-12, Financial Services-Insurance (Topic 944):Targeted Improvements to the Accounting for Long Duration Contracts.  The updated accounting guidance requires changes to the measurement and disclosure of long-duration contracts.  The guidance requires entities to annually update cash flow assumptions, including morbidity and persistency, and update discount rate assumptions quarterly using an upper-medium grade fixed-income instrument yield.  The effect of changes in cash flow assumptions will be recorded in the Company's results of operations and the effect of changes in discount rate assumptions will be recorded in Other comprehensive income.  This guidance is effective for interim and annual periods beginning after December 15, 2021, and the Company will adopt it on that effective date.  The guidance requires restatement of prior periods presented.  The Company is currently evaluating the method of adoption and the effect the updated guidance will have on its financial statements, including the increased disclosure requirements.  The annual updating of cash flow assumptions is expected to increase income statement volatility.  The quarterly change in discount rate is expected to increase volatility in the Company’s stockholders' equity, but that will be somewhat mitigated because Shadow Adjustments are eliminated under the new guidance.  While the requirements of the new guidance represent a material change from existing GAAP, the underlying economics of the business and related cash flows are unchanged.Insurance OperationsPremiums:Insurance premiums on property and casualty insurance contracts are recognized in proportion to the underlying risk insured and are principally earned ratably over the term of the policies.  Premiums on long term care contracts are earned ratably over the policy year in which they are due.  The reserve for unearned premiums represents the portion of premiums written relating to the unexpired terms of coverage.Insurance receivables include balances due currently or in the future, including amounts due from insureds related to paid losses under high deductible policies, and are presented at unpaid balances, net of an allowance for uncollectible receivables.  Amounts are considered past due based on policy payment terms.  The allowance is determined based on periodic evaluations of aged receivables, historical business default data, management's experience and current economic conditions.  Insurance receivables and any related allowance are written off after collection efforts are exhausted or a negotiated settlement is reached.Property and casualty contracts that are retrospectively rated contain provisions that result in an adjustment to the initial policy premium depending on the contract provisions and loss experience of the insured during the experience period.  For such contracts, the Company estimates the amount of ultimate premiums that the Company may earn upon completion of the experience period and recognizes either an asset or a liability for the difference between the initial policy premium and the estimated ultimate premium.  The Company adjusts such estimated ultimate premium amounts during the course of the experience period based on actual results to date.  The resulting adjustment is recorded as either a reduction of or an increase to the earned premiums for the period.Claim and claim adjustment expense reserves:Claim and claim adjustment expense reserves, except reserves for structured settlements not associated with A&EP, workers' compensation lifetime claims and long term care claims, are not discounted and are based on i) case basis estimates for losses reported on direct business, adjusted in the aggregate for ultimate loss expectations; ii) estimates of incurred but not reported (IBNR) losses; iii) estimates of losses on assumed reinsurance; iv) estimates of future expenses to be incurred in the settlement of claims; v) estimates of salvage and subrogation recoveries and vi) estimates of amounts due from insureds related to losses under high deductible policies.  Management considers current conditions and trends as well as past Company and industry experience in establishing these estimates.  The effects of inflation, which can be significant, are implicitly considered in the reserving process and are part of the recorded reserve balance.  Ceded claim and claim adjustment expense reserves are reported as a component of Reinsurance receivables on the Consolidated Balance Sheets.Claim and claim adjustment expense reserves are presented net of anticipated amounts due from insureds related to losses under deductible policies of$1.2 billionas ofDecember 31, 2019and2018.  A significant portion of these amounts are supported by collateral.  The Company has an allowance for uncollectible deductible amounts, which is presented as a component of the allowance for doubtful accounts included in Insurance receivables onthe Consolidated Balance Sheets.Structured settlements have been negotiated for certain property and casualty insurance claims.  Structured settlements are agreements to provide fixed periodic payments to claimants.  The Company's obligations for structured settlements not funded by annuities are included in claim and claim adjustment expense reserves and carried at present values determined using interest rates ranging from5.5%to7.6%and5.5%to8.0%as ofDecember 31, 2019and2018.  As ofDecember 31, 2019and2018, the discounted reserves for unfunded structured settlements were$497 millionand$512 million, net of discount of$724 millionand$760 million.  For the years ended December 31,2019,2018and2017, the amount of interest recognized on the discounted reserves of unfunded structured settlements was$36 million,$40 millionand$41 million, respectively.  This interest accretion is presented as a component of Insurance claims and policyholders’ benefits on the Consolidated Statements of Operations, but is excluded from the Company’s disclosure of prior year loss reserve development.Workers' compensation lifetime claim reserves are calculated using mortality assumptions determined through statutory regulation and economic factors.  AtDecember 31, 2019and2018, workers' compensation lifetime claim reserves are discounted at a3.5%interest rate.  As ofDecember 31, 2019and2018, the discounted reserves for workers’ compensation lifetime claim reserves were$293 millionand$343 million, net of discount of$135 millionand$168 million.  For the years ended December 31,2019,2018and2017, the amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves was$21 million,$16 millionand$19 million, respectively.  This interest accretion is presented as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations, but is excluded from the Company's disclosure of prior year loss reserve development.Long term care claim reserves are calculated using mortality and morbidity assumptions based on Company and industry experience.  Long term care claim reserves are discounted at a weighted average interest rate of5.9%and6.0%as ofDecember 31, 2019and2018.  As ofDecember 31, 2019and2018, such discounted reserves totaled$2.7 billionand$2.6 billion, net of discount of$462 millionand$460 million.Future policy benefit reserves:Future policy benefit reserves represent the active life reserves related to the Company's long term care policies and are computed using the net level premium method, which incorporates actuarial assumptions as to morbidity, persistency, inclusive of mortality, discount rate, future premium rate adjustments and expenses.  Expense assumptions primarily relate to claim adjudication.  These assumptions are locked in over the life of the policy; however if a premium deficiency emerges, the assumptions are unlocked and the future policy benefit reserves are increased.  The September 30, 2019 gross premium valuation (GPV) indicated a premium deficiency of$216 millionand future policy benefit reserves at that date were increased accordingly.  As a result, the long term care active life reserves carried as of September 30, 2019 represent management’s best estimate assumptions at that date with no margin for adverse deviation.  Long term care active life reserves are discounted at a weighted average interest rate of5.7%and6.9%as ofDecember 31, 2019and2018.In circumstances where the cash flow projections supporting future policy benefit reserves are expected to result in profits being recognized in early future years followed by losses in later future years, the future policy benefit reserves are increased in the future profitable years by an amount necessary to offset losses that are projected to be recognized in later future years.  The amount of the additional future policy benefit reserves recorded in each period is determined by applying the ratio of the present value of future losses divided by the present value of future profits from the most recently completed GPV to long term care core income in that period.Insurance-related assessments:Liabilities for insurance-related assessments are accrued when an assessment is probable, when it can be reasonably estimated and when the event obligating the entity to pay an imposed or probable assessment has occurred.  Liabilities for insurance-related assessments are not discounted and are included as part of Other liabilities on the Consolidated Balance Sheets.  As ofDecember 31, 2019and2018, the liability balances were$84 millionand$108 million.Reinsurance:Reinsurance accounting allows for contractual cash flows to be reflected as premiums and losses.  To qualify for reinsurance accounting, reinsurance agreements must include risk transfer.  To meet risk transfer requirements, a reinsurance contract must include both insurance risk, consisting of underwriting and timing risk, and a reasonable possibility of a significant loss for the assuming entity.Reinsurance receivables related to paid losses are presented at unpaid balances.  Reinsurance receivables related to unpaid losses are estimated in a manner consistent with claim and claim adjustment expense reserves or future policy benefit reserves.  Reinsurance receivables are reported net of an allowance for uncollectible amounts on the Consolidated Balance Sheets.  The cost of reinsurance is primarily accounted for over the life of the underlying reinsured policies using assumptions consistent with those used to account for the underlying policies or over the reinsurance contract period.  The ceding of insurance does not discharge the primary liability of the Company.The Company has established an allowance for uncollectible reinsurance receivables which relates to both amounts already billed on ceded paid losses as well as ceded reserves that will be billed when losses are paid in the future.  The allowance for uncollectible reinsurance receivables is estimated on the basis of periodic evaluations of balances due from reinsurers, reinsurer solvency, industry experience and current economic conditions.  Reinsurer financial strength ratings are updated and reviewed on an annual basis or sooner if the Company becomes aware of significant changes related to a reinsurer.  Because billed receivables generally approximate5%or less of total reinsurance receivables, the age of the reinsurance receivables related to paid losses is not a significant input into the allowance analysis.  Changes in the allowance for uncollectible reinsurance receivables are presented as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.Amounts are considered past due based on the reinsurance contract terms.  Reinsurance receivables related to paid losses and any related allowance are written off after collection efforts have been exhausted or a negotiated settlement is reached with the reinsurer.  Reinsurance receivables from insolvent insurers related to paid losses are written off when the settlement due from the estate can be reasonably estimated.  At the time reinsurance receivables related to paid losses are written off, any required adjustment to reinsurance receivables related to unpaid losses is recorded as a component of Insurance claims and policyholders' benefits on the Consolidated Statements of Operations.A loss portfolio transfer is a retroactive reinsurance contract.  If the cumulative claim and allocated claim adjustment expenses ceded under a loss portfolio transfer exceed the consideration paid, the resulting gain from such excess is deferred and amortized into earnings in future periods in proportion to actual recoveries under the loss portfoliotransfer.  In any period in which there is a revised estimate of claim and allocated claim adjustment expenses and the loss portfolio transfer is in a gain position, the deferred gain is recalculated as if the revised estimate was available at the inception date of the loss portfolio transfer and the change in the deferred gain is recognized in earnings.Deferred acquisition costs:Deferrable acquisition costs include commissions, premium taxes and certain underwriting and policy issuance costs which are incremental direct costs of successful contract acquisitions.  Acquisition costs related to property and casualty business are deferred and amortized ratably over the period the related premiums are earned.  Deferred acquisition costs are presented net of ceding commissions and other ceded acquisition costs.The Company evaluates deferred acquisition costs for recoverability.  Anticipated investment income is considered in the determination of the recoverability of deferred acquisition costs.  Adjustments, if necessary, are recorded in current period results of operations.Policyholder dividends:Policyholder dividends are paid to participating policyholders within the worker’s compensation and surety lines of business.  Net written premiums for participating dividend policies were approximately1%of total net written premiums for each of the years ended December 31, 2019, 2018 and 2017.  Dividends to policyholders are accrued according to the Company's best estimate of the amount to be paid in accordance with contractual provisions and applicable state laws.  Dividends to policyholders are presented as a component of Insurance claims & policyholders' benefits on the Consolidated Statements of Operations and Other liabilities on the Consolidated Balance Sheets.InvestmentsThe Company classifies its fixed maturity securities as either available-for-sale or trading, and as such, they are carried at fair value.  Changes in fair value of trading securities are reported within Net investment income on the Consolidated Statements of Operations.  Changes in fair value related to available-for-sale securities are reported as a component of Other comprehensive income.The cost of fixed maturity securities classified as available-for-sale is adjusted for amortization of premiums and accretion of discounts, which are included in Net investment income on the Consolidated Statements of Operations.  The amortization of premium and accretion of discount for fixed maturity securities takes into consideration call and maturity dates that produce the lowest yield.For asset-backed securities included in fixed maturity securities, the Company recognizes income using an effective yield based on anticipated prepayments and the estimated economic life of the securities.  When estimates of prepayments change, the effective yield is recalculated to reflect actual payments to date and anticipated future payments.To the extent that unrealized gains on fixed maturity securities supporting long term care products and structured settlements not funded by annuities would result in a premium deficiency if those gains were realized, a related increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (Shadow Adjustments).  Shadow Adjustments, net of tax, increased$1,120 millionand decreased$333 millionfor the years endedDecember 31, 2019and2018, respectively.  As ofDecember 31, 2019and2018, net unrealized gains on investments included in Accumulated other comprehensive income (AOCI) were correspondingly reduced by Shadow Adjustments of$2,198 millionand$1,078 million, respectively.Equity securities are carried at fair value.  The Company's non-redeemable preferred stock contain characteristics of debt securities, are priced similarly to bonds and are held primarily for income generation through periodic dividends.  While recognition of gains and losses on these securities is not discretionary, management does not consider the changes in fair value of non-redeemable preferred stock to be reflective of our primary operations.  As such, the changes in the fair value of these securities are recorded through Net investment gains (losses).  The Company owns certain common stock with the intention of holding the securities primarily for market appreciation and as such, the changes in the fair value of these securities are recorded through Net investment income.  Prior to 2018, equity securities were considered available for sale with changes in fair value reported as a component of Other comprehensive income.The Company's carrying value of investments in limited partnerships is its share of the net asset value of each partnership, as determined by the general partner.  Certain partnerships for which results are not available on a timely basis are reported on a lag, primarily three months or less.  Changes in net asset values are accounted for under the equity method and recorded within Net investment income on the Consolidated Statements of Operations.Mortgage loans are commercial in nature, are carried at unpaid principal balance, net of unamortized fees and any valuation allowance, and are recorded once funded.  Interest income from mortgage loans is recognized on an accrual basis using the effective yield method.  Mortgage loans are considered to be impaired loans when it is probable that contractual principal and interest payments will not be collected.  The Company evaluates loans for impairment on an individual loan basis and identifies loans for evaluation of impairment based on the collection experience of each loan and other credit quality indicators such as debt service coverage ratio and the creditworthiness of the borrower or tenants of credit tenant loan properties.  Accrual of income is generally suspended for mortgage loans that are impaired and collection of principal and interest payments is unlikely.  Mortgage loans are considered past due when full principal or interest payments have not been received according to contractual terms.  As ofDecember 31, 2019and2018, there were no loans past due or in non-accrual status, and no valuation allowance was recorded.Other invested assets include overseas deposits.  Overseas deposits are valued using the net asset value per share (or equivalent) practical expedient.  They are primarily short-term government securities, agency securities and corporate bonds held in trusts that are managed by Lloyd's of London.  These funds are required of Lloyd's syndicates to protect policyholders in overseas markets and may be denominated in local currency.Short term investments are carried at fair value, with the exception of cash accounts earning interest, which are carried at cost and approximate fair value.  Changes in fair value are reported as a component of Other comprehensive income.Purchases and sales of all securities are recorded on the trade date, except for private placement debt securities, including bank loan participations, which are recorded once funded.  Net investment gains and losses are determined on the basis of the cost or amortized cost of the specific securities sold.In the normal course of investing activities, the Company enters into relationships with variable interest entities (VIEs), as both an investor in limited partnerships and asset-backed securities issued by third-party VIEs.  The Company is not the primary beneficiary of these VIEs, and therefore does not consolidate them.  The Company determines whether it is the primary beneficiary of a VIE based on a qualitative assessment of the relative power and benefits of the Company and the other participants in the VIE.  The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying values included in the Company’s Consolidated Balance Sheets and any unfunded commitments.An available for sale security is impaired if the fair value of the security is less than its cost adjusted for accretion, amortization and previously recorded OTTI losses, otherwise defined as an unrealized loss.  When a security is impaired, the impairment is evaluated to determine whether it is temporary or other-than-temporary.  When the decline in value is determined by the Company to be other-than-temporary, losses are recognized within Net investment gains (losses) on the Consolidated Statements of Operations.Significant judgment is required in the determination of whether an OTTI loss has occurred for a security.  The Company follows a consistent and systematic process for determining and recording an OTTI loss, including the evaluation of securities in an unrealized loss position on at least a quarterly basis.The Company’s assessment of whether an OTTI loss has occurred incorporates both quantitative and qualitative information.  Fixed maturity securities that the Company intends to sell, or it more likely than not will be required to sell before recovery of amortized cost, are considered to be other-than-temporarily impaired and the entire difference between the amortized cost basis and fair value of the security is recognized as an OTTI loss in earnings.  The remaining fixed maturity securities in an unrealized loss position are evaluated to determine if a credit loss exists.  The factors considered include (a) the financial condition and near-term and long-term prospects of the issuer, (b) whether the debtor is current on interest and principal payments, (c) credit ratings of the securities and (d) general market conditions and industry or sector specific outlook.  The Company also considers results and analysis of cash flow modeling for asset-backed securities, and when appropriate, other fixed maturity securities. If the present value of the modeled expected cash flows equals or exceeds the amortized cost of a security, no creditloss is judged to exist and the asset-backed security is deemed to be temporarily impaired.  If the present value of the expected cash flows is less than amortized cost, the security is judged to be other-than-temporarily impaired for credit reasons and that shortfall, referred to as the credit component, is recognized as an OTTI loss in earnings.  The difference between the adjusted amortized cost basis and fair value, referred to as the non-credit component, is recognized as OTTI in Other comprehensive income.  In subsequent reporting periods, a change in intent to sell or further credit impairment on a security whose fair value has not deteriorated will cause the non-credit component originally recorded as OTTI in Other comprehensive income to be recognized as an OTTI loss in earnings.  Significant assumptions enter into these cash flow projections including delinquency rates, probable risk of default, loss severity upon a default, over collateralization and interest coverage triggers and credit support from lower level tranches.Prior to 2018, the Company applied the same impairment model as described above for the majority of its non-redeemable preferred stock securities on the basis that these securities possess characteristics similar to debt securities.  For all other equity securities, in determining whether the security was other-than-temporarily impaired, the Company considered a number of factors including, but not limited to: (a) the length of time and the extent to which the fair value has been less than amortized cost, (b) the financial condition and near term prospects of the issuer, (c) the intent and ability of the Company to retain its investment for a period of time sufficient to allow for an anticipated recovery in value and (d) general market conditions and industry or sector specific outlook.Deferred Non-Insurance Warranty Revenue and Acquisition ExpenseNon-insurance warranty revenue is primarily generated from separately-priced service contracts that provide mechanical breakdown and other coverages to vehicle or consumer goods owners.  The warranty contracts generally provide coverage from1 monthto10 years.  For warranty products where the Company acts as the principal in the transaction, Non-insurance warranty revenue is reported on a gross basis, with amounts paid by customers reported as Non-insurance warranty revenue and commissions paid to agents reported as Non-insurance warranty expense.  Prior to 2018, Non-insurance warranty revenue was recognized net of dealer costs and earned based on the estimated claims emergence pattern over the contract period.Non-insurance warranty revenue is reported net of any premiums related to contractual liability coverage issued by the Company's insurance operations.  Additionally, the Company provides warranty administration services for dealer and manufacturer obligor warranty products, which include limited warranties and guaranteed automobile protection waivers.  The Company recognizes Non-insurance warranty revenue over the service period in proportion to the actuarially determined expected claims emergence pattern.  Customers pay in full at the inception of the warranty contract.  The liability for deferred revenue represents the unearned portion of revenue in advance of the Company's performance.  The deferred revenue balance includes amounts which are refundable on a pro rata basis upon cancellation.Dealers, retailers and agents earn commission for assisting the Company in obtaining non-insurance warranty contracts.  Additionally, the Company utilizes a third-party to perform warranty administrator services for its consumer goods warranties.  These costs, which are deferred and recorded as Deferred non-insurance warranty acquisition expense, are amortized to Non-insurance warranty expense consistent with how the related revenue is recognized.  The Company evaluates deferred costs for recoverability including consideration of anticipated investment income.  Adjustments to deferred costs, if necessary, are recorded in the current period results of operations.Income TaxesThe Company and its eligible subsidiaries (CNA Tax Group) are included in the consolidated federal income tax return of Loews and its eligible subsidiaries.  The Company accounts for income taxes under the asset and liability method.  Under the asset and liability method, deferred income taxes are recognized for temporary differences between the financial statement and tax return bases of assets and liabilities, based on enacted tax rates and other provisions of the tax law.  The effect of a change in tax laws or rates on deferred tax assets and liabilities is recognized in income in the period in which such change is enacted.  Future tax benefits are recognized to the extent that realization of such benefits is more likely than not, and a valuation allowance is established for any portion of a deferred tax asset that management believes will not be realized.  The Company releases tax effects from AOCI utilizing the security-by-security approach for Net unrealized gains (losses) on investments with OTTIlosses and Net unrealized gains (losses) on other investments.  For Pension and postretirement benefits, tax effects from AOCI are released at enacted tax rates based on the pre-tax adjustments to pension liabilities or assets recognized within Other comprehensive income.Pension and Postretirement BenefitsThe Company recognizes the overfunded or underfunded status of its defined benefit plans in Other assets or Other liabilities on the Consolidated Balance Sheets.  Changes in funded status related to prior service costs and credits, and actuarial gains and losses arising from differences between actual experience and actuarial assumptions, are recognized in the year in which the changes occur through Other comprehensive income.  Unrecognized actuarial gains and losses in excess of 10% of the greater of the beginning of the year projected benefit obligation or fair value of plan assets (the corridor) are amortized as a component of net periodic pension cost (benefit) over the average remaining life expectancy of the plan participants.  Annual service cost, interest cost, expected return on plan assets, amortization of prior service costs and credits and amortization of actuarial gains and losses are recognized on the Consolidated Statements of Operations.The vested benefit obligation for the CNA Retirement Plan is determined based on eligible compensation and accrued service for previously entitled employees.  Effective June 30, 2015, future benefit accruals under the CNA Retirement Plan were eliminated and the benefit obligations were frozen.Stock-Based CompensationThe Company records compensation expense using the fair value method for all awards it grants, modifies or cancels primarily on a straight-line basis over the requisite service period, generallythree years.Foreign CurrencyThe Company's foreign subsidiaries' balance sheet accounts are translated at the exchange rates in effect at each reporting date and income statement accounts are either translated at the exchange rates on the date of the transaction or at average exchange rates.  Foreign currency translation gains and losses are reflected in Stockholders' equity as a component of AOCI.  Foreign currency transaction gains of$1 million,$1 millionand$27 millionwere included in determining Net income for the years endedDecember 31, 2019,2018and2017, respectively.LeasesA lease provides the lessee the right to control the use of an identified asset for a period of time in exchange for consideration.  Operating lease ROU assets and lease liabilities are included in Other assets and Other liabilities on the Company's Consolidated Balance Sheets.ROU assets represent the Company's right to use an underlying asset for the lease term and operating lease liabilities represent the Company's obligation to make lease payments arising from the lease.  The Company determines if an arrangement is a lease at inception.  Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term.  Most operating leases contain renewal options that provide for rent increases based on prevailing market conditions.  Certain leases contain options to terminate before maturity.  The lease term used to calculate the ROU asset includes any renewal options or lease termination options that the Company expects to exercise.  The discount rate used to determine the commencement date present value of lease payments is typically the Company’s secured borrowing rate, as most of the Company’s leases do not provide an implicit rate.  ROU assets include any lease payments required to be made prior to commencement and exclude lease incentives.  The Company has elected to account for its lease and non-lease components as a single lease component.  The Company’s non-lease components consist of variable lease costs not based on an index or rate and are excluded from the measurement of ROU assets and lease liabilities.  Variable lease costs not based on an index or rate are treated as period costs, and represent charges for services provided by the landlord and the Company's reimbursement to the landlord for costs such as real estate taxes and insurance.The Company occupies office facilities under lease agreements that expire at various dates.  The Company's lease agreements do not contain significant residual value guarantees, restrictions or covenants.  The Company does not have any significant finance leases.Property and EquipmentProperty and equipment are carried at cost less accumulated depreciation.  Depreciation is based on the estimated useful lives of the various classes of property and equipment and is determined principally on the straight-line method.  Furniture and fixtures are depreciated overseven years.  Office equipment is depreciated overfive years.  The estimated lives for data processing equipment and software generally range fromthreetofive years, but can be as long asten years.  Leasehold improvements are depreciated over the corresponding lease terms not to exceed the underlying asset life.GoodwillGoodwill represents the excess of purchase price over the fair value of the net assets of acquired entities and businesses.  Goodwill in the International segment may change from period to period as a result of foreign currency translation.Goodwill is tested for impairment annually or when certain triggering events require such tests. As a result of reviews completed for the year endedDecember 31, 2019, the Company determined that the estimated fair value of the reporting units were in excess of their carrying value including Goodwill.  Changes in future periods in assumptions about the level of economic capital, business growth, earnings projections or the weighted average cost of capital could result in goodwill impairment.Other Intangible AssetsOther intangible assets are reported within Other assets on the Consolidated Balance Sheets.Finite-lived intangible assets are amortized over their estimated useful lives.  Indefinite-lived other intangible assets are tested for impairment annually or when certain triggering events require such tests.Earnings (Loss) Per Share DataEarnings (loss) per share is based on weighted average number of outstanding common shares.  Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period.  Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.For the years endedDecember 31, 2019,2018and2017, approximately961 thousand,943 thousandand988 thousandpotential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share.  For those same periods,1 thousand,6 thousandand less than1 thousandpotential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share, because the effect would have been antidilutive.Supplementary Cash Flow InformationCash payments made for interest were$136 million,$145 millionand$155 millionfor the years endedDecember 31, 2019,2018and2017.  Cash payments made for income taxes were$255 million,$308 millionand$152 millionfor the years endedDecember 31, 2019,2018and2017.
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|(In millions)                                                  | Balance as of December 31, 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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