Fair Value Measurements - Gains and Losses on Derivative Financial Instruments (Details) - Fair Value, Measurements, Recurring - Cost of Sales - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Foreign Exchange Forward Contracts
Derivatives Fair Value [Line Items]
Recorded gains (loss) into AOCI net of tax		$ (2)		$ (3)
Less: reclassified from AOCI into gain (loss)	$ (1)	2	$ (1)	3
Gains and losses on derivative financial instruments	1	(4)	$ 1	$ (6)
Foreign Exchange Swaps
Derivatives Fair Value [Line Items]
Recorded into gain (loss)	(2)	2
Gains and losses on derivative financial instruments	$ (2)	$ 2

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.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after 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 instruments gain (loss) recognized in income statement and other comprehensive income.

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