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Supplemental Information (Derivatives and Hedging - Counterparty Credit Risk) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivative, Credit Risk Related Contingent Features [Abstract]    
Securities held as collateral $ 1,038 $ 1,277
Cash collateral 2,991 1,141
Total fair value of collateral 4,882  
Collateral Already Posted, Aggregate Fair Value 861  
Exposure to counterparties including interest net collateral excluding embedded derivatives 511  
Derivative liability after collateral and outstanding interest payments excluding embedded derivatives 721  
Amounts Offset In Statement Of Financial Position [Member]    
Derivative, Credit Risk Related Contingent Features [Abstract]    
Securities held as collateral (54) (107)
Cash collateral $ 3,843 $ 1,784