Financial Instruments - Summary of Derivative Instruments Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative asset	$ 7	$ 11
Total Derivative assets
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets	10	15
Total Derivative liabilities
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Liabilities	(3)	(4)
Derivatives Designated as Hedging Instruments
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative asset	7	5
Derivatives Designated as Hedging Instruments | Other current assets | Foreign exchange contracts - forwards
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets	6	7
Derivatives Designated as Hedging Instruments | Other current assets | Foreign currency options
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets	0	1
Derivatives Designated as Hedging Instruments | Accrued expenses and other current liabilities | Foreign exchange contracts - forwards
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Liabilities	(1)	0
Derivatives Designated as Hedging Instruments | Other long-term assets | Interest rate swaps
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets	2	0
Derivatives Designated as Hedging Instruments | Other long-term liabilities | Interest rate swaps
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Liabilities	0	(3)
Not Designated as Hedging Instrument | Foreign exchange contracts - forwards
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Net Derivative asset	0	6
Not Designated as Hedging Instrument | Other current assets | Foreign exchange contracts - forwards
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets	2	7
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign exchange contracts - forwards
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Liabilities	$ (2)	$ (1)