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Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Notional amount	$ 982,000,000		$ 982,000,000		$ 1,103,000,000
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months	80.00%		80.00%
Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months	10.00%		10.00%
Average Maturity of Foreign Exchange Hedging Contracts - within Six and Twelve Months	10.00%		10.00%
Net asset fair value	$ (3,000,000)		$ (3,000,000)		(11,000,000)
Net gain recorded in AOCL expected to be reclassified to net income in the future			7,000,000
Foreign currency transaction (losses) gains, before tax	(4,000,000)	$ (3,000,000)	(6,000,000)	$ (2,000,000)
Senior Note 2021
Derivative [Line Items]
Notional amount	200,000,000		200,000,000
Net Fair Value	2,000,000		2,000,000
Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Net asset fair value	(6,000,000)		(6,000,000)		(5,000,000)
Fair Value Hedges \| Senior Note 2021
Derivative [Line Items]
Ineffective portion recorded to earnings			0
Cash Flow Hedging \| Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Net asset fair value	$ 4,000,000		$ 4,000,000		$ 8,000,000