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Derivatives - Fair Value Hedges (Details) - Fair value hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivatives in Fair Value Hedging Relationships    
Gain (Loss) on Derivative Recognized in income $ (5) $ 29
Gain (Loss) on Hedged Item Recognized in Income 5 (29)
Interest rate swap contracts | Interest expense    
Derivatives in Fair Value Hedging Relationships    
Gain (Loss) on Derivative Recognized in income (5) 29
Gain (Loss) on Hedged Item Recognized in Income $ 5 $ (29)