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Derivative Instruments and Hedging Activities - Pre-tax Gains (Losses) (Details) - Not designated as a hedge - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative instruments and hedging activities    
Total gain (loss) $ (1) $ 0
Forward contracts | Other, net    
Derivative instruments and hedging activities    
Total gain (loss) $ (1) $ 0