Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and other asset-related charges	$ 0	$ 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets: [Abstract]
Deposits held in money market mutual funds	4	4	$ 5
Foreign exchange contracts	0	0	0
Total	4	4	5
Liabilities: [Abstract]
Foreign exchange contracts	0	0	0
Total	0	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Assets: [Abstract]
Deposits held in money market mutual funds	0	0	0
Foreign exchange contracts	2	2	19
Total	2	2	19
Liabilities: [Abstract]
Foreign exchange contracts	3	3	2
Total	3	3	2
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Assets: [Abstract]
Deposits held in money market mutual funds	0	0	0
Foreign exchange contracts	0	0	0
Total	0	0	0
Liabilities: [Abstract]
Foreign exchange contracts	0	0	0
Total	0	0	0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets: [Abstract]
Deposits held in money market mutual funds	4	4	5
Foreign exchange contracts	2	2	19
Total	6	6	24
Liabilities: [Abstract]
Foreign exchange contracts	3	3	2
Total	$ 3	$ 3	$ 2