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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative instruments and hedging activities        
Total gain (loss) $ 1 $ (3) $ 0 $ (3)
Forward contracts | Other, net        
Derivative instruments and hedging activities        
Total gain (loss) 1 0 0 0
Interest rate swaps        
Derivative instruments and hedging activities        
Total gain (loss) $ (1) $ (3) $ (1) $ (3)