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Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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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

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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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