Financial Instruments - Foreign Exchange Risk Management (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Foreign Exchange Contracts [Line Items]
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months		85.00%
Average Maturity of Foreign Exchange Hedging Contracts - within Three to Six Months		8.00%
Average Maturity of Foreign Exchange Hedging Contracts - within Six to Twelve Months		7.00%
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		$ 1,788,000,000
Cash Flow Hedging [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Gain (Loss) on Derivative, Net		0	$ 0
U.S. Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		406,000,000
Japanese Yen/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		356,000,000
Japanese Yen/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		308,000,000
Euro/U.K. Pound Sterling
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		263,000,000
Canadian Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		100,000,000
Euro/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		94,000,000
U.S. Dollar/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		58,000,000
Euro/Japanese Yen
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		38,000,000
Swiss Franc/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		22,000,000
U.S. Dollar/Russian Ruble
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		19,000,000
Euro/Danish Krone
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		18,000,000
Mexican Peso/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		13,000,000
All Other
Summary of Foreign Exchange Hedging Positions [Abstract]
Gross Notional Value		93,000,000
Foreign exchange contract [Member]
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	(23,000,000)
Foreign exchange contract [Member] | U.S. Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	(4,000,000)
Foreign exchange contract [Member] | Japanese Yen/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	(5,000,000)
Foreign exchange contract [Member] | Japanese Yen/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	(9,000,000)
Foreign exchange contract [Member] | Euro/U.K. Pound Sterling
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	1,000,000
Foreign exchange contract [Member] | Canadian Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	(4,000,000)
Foreign exchange contract [Member] | Euro/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	(2,000,000)
Foreign exchange contract [Member] | U.S. Dollar/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	0
Foreign exchange contract [Member] | Euro/Japanese Yen
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	0
Foreign exchange contract [Member] | Swiss Franc/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	0
Foreign exchange contract [Member] | U.S. Dollar/Russian Ruble
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	0
Foreign exchange contract [Member] | Euro/Danish Krone
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	0
Foreign exchange contract [Member] | Mexican Peso/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	0
Foreign exchange contract [Member] | All Other
Summary of Foreign Exchange Hedging Positions [Abstract]
Fair Value Asset (Liability)	[1]	$ 0

[1] Represents the net receivable (payable) amount included in the Consolidated Balance Sheet at December 31, 2017.