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Supplemental Information (Derivatives and Hedging - Counterparty Credit Risk) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Derivative, Credit Risk Related Contingent Features [Abstract]    
Securities held as collateral $ 323 $ 442
Cash collateral 934 672
Total fair value of collateral 2,024  
Collateral Already Posted, Aggregate Fair Value 770  
Exposure to counterparties including interest net collateral excluding embedded derivatives 331  
Derivative liability after collateral and outstanding interest payments excluding embedded derivatives 714  
Amounts Offset In Statement Of Financial Position [Member]    
Derivative, Credit Risk Related Contingent Features [Abstract]    
Cash collateral $ 1,700 $ 2,025