Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	$ 40,000,000	$ 30,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	5,000,000	4,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	35,000,000	26,000,000
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Accounts Receivable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts asset value	1,000,000	1,000,000
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Accounts Receivable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts asset value	1,000,000	2,000,000
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	3,000,000	1,000,000
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	5,000,000	4,000,000
Fair Value, Measurements, Recurring [Member] | Currency Swap [Member] | Other Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	0	3,000,000
Fair Value, Measurements, Recurring [Member] | Currency Swap [Member] | Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	$ 177,000,000	$ 12,000,000