Derivative Instruments - Narrative (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Foreign exchange forward contracts - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Net gains related to derivatives recorded in other comprehensive income (loss) expected to be reclassified into earnings	$ 4
Aggregate notional value	$ 133	$ 78

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

No definition available.

Name:	us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration