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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value Measurements - Derivative Financial Instruments Designated and Non-designated as Hedging Instruments (Details) - Fair Value, Measurements, Recurring - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Nominal Value	$ 108,000,000
Derivatives not designated as hedging instruments \| Other current/non current assets
Derivatives, Fair Value [Line Items]
Derivative Asset (Other current/non current assets)	1,000,000
Derivatives not designated as hedging instruments \| Other current/non current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability (Other current/non current liabilities)	0
Derivatives not designated as hedging instruments \| Foreign exchange swaps \| Less Than Six Months
Derivatives, Fair Value [Line Items]
Nominal Value	108,000,000
Derivatives not designated as hedging instruments \| Foreign exchange swaps \| Less Than Six Months \| Other current/non current assets
Derivatives, Fair Value [Line Items]
Derivative Asset (Other current/non current assets)	1,000,000
Derivatives not designated as hedging instruments \| Foreign exchange swaps \| Less Than Six Months \| Other current/non current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability (Other current/non current liabilities)	$ 0
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Nominal Value		$ 67,000,000
Derivatives designated as hedging instruments \| Other current/non current assets
Derivatives, Fair Value [Line Items]
Derivative Asset (Other current/non current assets)		0
Derivatives designated as hedging instruments \| Other current/non current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability (Other current/non current liabilities)		1,000,000
Derivatives designated as hedging instruments \| Foreign exchange forward contracts \| Less Than One Year \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Nominal Value		67,000,000
Derivatives designated as hedging instruments \| Foreign exchange forward contracts \| Less Than One Year \| Other current/non current assets \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset (Other current/non current assets)		0
Derivatives designated as hedging instruments \| Foreign exchange forward contracts \| Less Than One Year \| Other current/non current liabilities \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Liability (Other current/non current liabilities)		$ 1,000,000