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Derivative Instruments Narratives (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Aggregate fair value of all OTC derivatives with credit-risk-related contingent features that were in a net liability position $ 3,200 $ 2,400
Aggregate fair value of collateral posted 3,100 2,200
Additional collateral required or amount required to immediately settle our positions if all of the credit-risk-related contingency features were triggered $ 244 $ 257