|**Derivative Financial Instruments (Tables)**                                                                                    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                           
|-------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Summary of Derivative Instruments [Abstract]**                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                           
|Summary of aggregate contractual or notional amounts and gross estimated fair values related to derivative financial instruments | Derivative Financial InstrumentsDecember 31, 2013Contractual/NotionalAmountEstimated Fair Value(In millions)Asset(Liability)Without hedge designationEquity warrants$5$—$—December 31, 2012Contractual/NotionalAmountEstimated Fair Value(In millions)Asset(Liability)Without hedge designationCredit default swaps - purchased protection$20$—$(1)Currency forwards59—(2)Equity warrants5——Total$84$—$(3)
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|December 31, 2013                                                                                                                | Contractual/NotionalAmount                                                                                                                                                                                                                                                                                                                                                                                
|(In millions)                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                           
|Without hedge designation                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                           
|Equity warrants                                                                                                                  | $                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                
|                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                           
|December 31, 2012                                                                                                                | Contractual/NotionalAmount                                                                                                                                                                                                                                                                                                                                                                                
|(In millions)                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                           
|Without hedge designation                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                           
|Credit default swaps - purchased protection                                                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                         
|Currency forwards                                                                                                                | 59                                                                                                                                                                                                                                                                                                                                                                                                        
|Equity warrants                                                                                                                  | 5                                                                                                                                                                                                                                                                                                                                                                                                         
|Total                                                                                                                            | $                                                                                                                                                                                                                                                                                                                                                                                                         

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