Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative gain recognized in OCI (effective portion)	$ 3	$ 12
Net gain recorded in AOCL expected to be reclassified to net income in the future	6
Foreign currency transaction (losses) gains, before tax	(2)	2
Foreign Exchange Forward [Member] \| Cash Flow Hedging [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative gain recognized in OCI (effective portion)	3	12
Interest Expense [Member] \| Interest Rate Contract [Member] \| Fair Value Hedging [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative gain (loss) recognized in interest expense	2	(5)
Hedged item (loss) gain recognized in interest expense	(2)	5
Cost of Sales [Member] \| Foreign Exchange Forward [Member] \| Cash Flow Hedging [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative gain (loss) reclassified from AOCL to income - Cost of sales (effective portion)	1	(12)
Derivative gain (loss) reclassified from AOCL to income - Cost of Sales (ineffective)	0	0
Derivative, Underlying Amount	0	0
Foreign Currency Gain (Loss) [Member] \| Foreign Exchange Forward [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (5)	$ 0

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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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 of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount of gain (loss) from the ineffectiveness of the hedge.

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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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Derivative, Underlying Amount

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