Derivative Instruments - Derivative Instruments Gain (Loss) (Details) - Derivative instruments not designated as hedges: - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized in income	$ 5	$ 15	$ 1
Foreign exchange contracts | Foreign exchange (loss) gain
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized in income	5	11	6
Forward interest rate swap contracts | Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized in income	$ 0	$ 4	$ (5)