Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Summary of Derivative Instruments Gains (Losses) [Abstract]
Net gains recorded in AOCL expected to be reclassified to net income in the future			$ 2
Foreign Currency Transaction Gains (Losses), before Tax	$ (1)	$ (1)	1	$ (4)
Cash Flow Hedging [Member] \| Foreign Exchange Forward [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative (loss) gain recognized in OCI (effective portion)	(2)	(22)	10	(13)
Interest Expense [Member] \| Fair Value Hedging [Member] \| Interest Rate Contract [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative (loss) gain recognized in interest expense	(1)	2	(6)	1
Hedged item gain (loss) recognized in interest expense	1	(2)	6	(1)
Cost of Sales [Member] \| Cash Flow Hedging [Member] \| Foreign Exchange Forward [Member]
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative Loss reclassified from AOCL to income - Cost of sales (effective portion)	0	(4)	(12)	(8)
Derivative loss reclassified from AOCL to income - Cost of Sales (ineffective)	0	0	0	0
Derivative, Underlying Amount	0	0	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	$ 18	$ (14)	$ 18	$ (10)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
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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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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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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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-Publisher FASB
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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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Derivative, Underlying Amount

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