Derivative Instruments - Location and Fair Values of Cash Flow Hedges (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Cash Flow Hedges | Foreign exchange forward contracts | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative, fair value	$ 8	$ 23
Cash Flow Hedges | Foreign exchange forward contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value	0	2
Cash Flow Hedges | Interest rate swap contracts | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value	169	0
Net Investment Hedges | Cross currency swaps | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value	$ 43	$ 107