Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in OCI	$ 9,000,000	$ (28,000,000)	$ 18,000,000
Accumulated Other Comprehensive Loss, Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	4,000,000	(12,000,000)	(13,000,000)
Foreign Currency Transaction Gain (Loss), before Tax	(5,000,000)	(4,000,000)	(13,000,000)
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	21,000,000	(44,000,000)	172,000,000
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)	(3,000,000)
Hedged Item Gain (Loss) Recognized in Income	3,000,000	3,000,000	3,000,000
Cash Flow Hedging [Member] \| Foreign exchange contracts - forwards [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Gain (Loss) Recognized in OCI	9,000,000	(28,000,000)	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	$ (14,000,000)	$ (35,000,000)	$ 42,000,000

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.

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

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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.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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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.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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