Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Loss, Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 12,000,000	$ 13,000,000	$ (1,000,000)
Currency (losses) gains, net	(4,000,000)	(13,000,000)	(2,000,000)
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	(44,000,000)	172,000,000	17,000,000
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	0	0
Cash Flow Hedging [Member] \| Other expense - Currency gains (losses), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in Income	0	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)	(3,000,000)	2,000,000
Hedged Item Gain (Loss) Recognized in Income	3,000,000	3,000,000	(2,000,000)
Cash Flow Hedging [Member] \| Foreign exchange contracts - forwards [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in OCI	(28,000,000)	20,000,000	17,000,000
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	$ (35,000,000)	$ 42,000,000	$ (23,000,000)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

+ References

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Currency gains (losses), net, includes the mark-to-market of the derivatives not designated as hedging instruments and the related cost of those derivatives as well as the re-measurement of foreign currency denominated assets and liabilities.

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