Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	$ 0	$ 5,000,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	21,000,000	35,000,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Accounts Receivable Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts asset value	2,000,000	1,000,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Other Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	1,000,000	3,000,000
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] | Accounts Receivable Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts asset value	6,000,000	1,000,000
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] | Other Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	5,000,000	5,000,000
Currency Swap [Member] | Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Currency contracts liability value	$ 118,000,000	$ 177,000,000