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Supplemental Information (Derivatives and Hedging - Counterparty Credit Risk) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Derivative, Credit Risk Related Contingent Features [Abstract]    
Securities held as collateral $ 741 $ 1,277
Cash collateral 3,232 1,141
Collateral Already Posted, Aggregate Fair Value 931  
Exposure to counterparties including interest net collateral excluding embedded derivatives 363  
Derivative liability after collateral and outstanding interest payments excluding embedded derivatives 728  
Amounts Offset In Statement Of Financial Position [Member]    
Derivative, Credit Risk Related Contingent Features [Abstract]    
Securities held as collateral (47) (107)
Cash collateral $ 4,154 $ 1,784