Derivatives and Hedging - Notional and Fair Values of Derivative Instruments (Details) - Foreign exchange contracts - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value
Notional Amount	$ 1,048	$ 1,000
Derivative Assets	33	34
Derivative Liabilities	$ 1	1
Term of derivative contract	90 days
Other current assets
Derivatives, Fair Value
Derivative Assets	$ 22	11
Other non-current assets
Derivatives, Fair Value
Derivative Assets	11	23
Other current liabilities
Derivatives, Fair Value
Derivative Liabilities	1	1
Accounted for as hedges
Derivatives, Fair Value
Notional Amount	628	633
Derivative Assets	33	33
Derivative Liabilities	0	0
Not designated as hedging instrument
Derivatives, Fair Value
Notional Amount	420	367
Derivative Assets	0	1
Derivative Liabilities	$ 1	$ 1