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Derivatives - Fair Value Hedges (Details) - Fair value hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivatives in Fair Value Hedging Relationships    
Gain (Loss) on Derivative Recognized in income $ (11) $ (5)
Gain (Loss) on Hedged Item Recognized in Income 11 5
Interest rate swap contracts | Interest expense.    
Derivatives in Fair Value Hedging Relationships    
Gain (Loss) on Derivative Recognized in income (11) (5)
Gain (Loss) on Hedged Item Recognized in Income $ 11 $ 5