Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Loss, Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 13,000,000	$ (1,000,000)	$ 22,000,000
Currency (losses) gains, net	(13,000,000)	(2,000,000)	(6,000,000)
Foreign exchange contracts - forwards [Member] | Not Designated as Hedging Instrument [Member] | Other expense - Currency gains (losses), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	172,000,000	17,000,000	(9,000,000)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	0
Fair Value Hedging [Member] | Interest rate contracts [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	(3,000,000)	2,000,000	5,000,000
Hedged Item Gain (Loss) Recognized in Income	3,000,000	(2,000,000)	(5,000,000)
Cash Flow Hedging [Member] | Foreign exchange contracts - forwards [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in OCI	20,000,000	17,000,000	(20,000,000)
Cash Flow Hedging [Member] | Foreign exchange contracts - forwards [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI to Income	$ 42,000,000	$ (23,000,000)	$ (39,000,000)