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Supplemental Information (Derivatives and Hedging - Counterparty Credit Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivative, Credit Risk Related Contingent Features [Abstract]    
Securities held as collateral $ 1,277 $ 3,114
Cash collateral 1,141 3,233
Total fair value of collateral 3,061  
Collateral Already Posted, Aggregate Fair Value 642  
Exposure to counterparties including interest net collateral excluding embedded derivatives 836  
Derivative liability after collateral and outstanding interest payments excluding embedded derivatives 690  
Amounts Offset In Statement Of Financial Position [Member]    
Derivative, Credit Risk Related Contingent Features [Abstract]    
Cash collateral $ 1,784 $ 3,695