|**Derivative Financial Instruments (Tables)**                                                                                    | 6 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 InstrumentsJune 30, 2014Contractual/NotionalAmountEstimated Fair Value(In millions)Asset(Liability)Without hedge designationCurrency forwards$6$—$—Equity warrants5——Total$11$—$—December 31, 2013Contractual/NotionalAmountEstimated Fair Value(In millions)Asset(Liability)Without hedge designationEquity warrants$5$—$—
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|                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                 
|June 30, 2014                                                                                                                    | Contractual/NotionalAmount                                                                                                                                                                                                                                                                                                                      
|(In millions)                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                 
|Without hedge designation                                                                                                        |                                                                                                                                                                                                                                                                                                                                                 
|Currency forwards                                                                                                                | $                                                                                                                                                                                                                                                                                                                                               
|Equity warrants                                                                                                                  | 5                                                                                                                                                                                                                                                                                                                                               
|Total                                                                                                                            | $                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                
|                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                 
|December 31, 2013                                                                                                                | Contractual/NotionalAmount                                                                                                                                                                                                                                                                                                                      
|(In millions)                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                 
|Without hedge designation                                                                                                        |                                                                                                                                                                                                                                                                                                                                                 
|Equity warrants                                                                                                                  | $                                                                                                                                                                                                                                                                                                                                               

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