|**Employee Retirement Benefits**                      | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|**Compensation and Retirement Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Employee Retirement Benefits                          | EMPLOYEE RETIREMENT BENEFITSThe following summarizes the components of net periodic costs for our qualified and supplemental pension plans:(In millions)Three months ended September 30,Nine months ended September 30,2013201220132012Service cost$4$3$10$9Interest cost441011Expected return on plan assets(5)(4)(13)(12)Amortization of actuarial loss and prior servicecost2275Net periodic benefit cost$5$5$14$13See our 2012 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 130, for information on our retirement benefits. We made matching contributions of$2 millionto our 401(k) and Top Hat savings plans during both the third quarter of 2013 and 2012 and contributions of$7 millionfor both the first nine months of 2013 and 2012.We contributed$15 millionto our qualified pension plan during the first quarter of 2013. We do not anticipate further contributions to our qualified pension plan during the remainder of 2013.
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|(In millions)                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Service cost                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest cost                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Expected return on plan assets                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Amortization of actuarial loss and prior servicecost  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Net periodic benefit cost                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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