Financial Instruments - Summary of Derivative Instruments Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	$ 53,000,000	$ 51,000,000
Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative instruments	92,000,000	62,000,000
Other Liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current liabilities	(39,000,000)	(11,000,000)
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(16,000,000)	8,000,000
Cash Flow Hedging [Member]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0
Foreign exchange contracts - forwards [Member] | Designated as Hedging Instrument [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(20,000,000)	1,000,000
Foreign exchange contracts - forwards [Member] | Designated as Hedging Instrument [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative instruments	6,000,000	4,000,000
Foreign exchange contracts - forwards [Member] | Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current liabilities	(26,000,000)	(2,000,000)
Foreign exchange contracts - forwards [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	69,000,000	43,000,000
Foreign exchange contracts - forwards [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative instruments	82,000,000	51,000,000
Foreign exchange contracts - forwards [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current liabilities	(13,000,000)	(8,000,000)
Options Held [Member] | Designated as Hedging Instrument [Member] | Other current assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative instruments	0	0
Options Held [Member] | Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Other current liabilities	0	(1,000,000)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]
Summary Of Derivative Instruments By Hedge Designation [Abstract]
Derivative instruments	4,000,000	$ 7,000,000
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging [Member]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0