Derivative Financial Instruments - Fair Value of Foreign Exchange Contracts (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other current assets
Derivatives, Fair Value [Line Items]
Assets	$ 0	$ 3
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	4	0
Other current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	0	(1)
Other non-current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	$ (24)	$ (46)