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Financial Instruments - Foreign Exchange Risk Management (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gross Notional Value | $ 164 | $ 167
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months | 65.00% |
Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months | 14.00% |
Average Maturity of Foreign Exchange Hedging Contracts - within Six and Twelve Months | 16.00% |
Average Maturity of Foreign Exchange Hedging Contracts - greater than twelve months | 5.00% |

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- Definition Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months Outstanding average forward exchange and purchase option contracts that mature within six months. + References No definition available. + Details
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- Definition Average Maturity of Foreign Exchange Hedging Contracts - within Three Months. Outstanding average forward exchange and purchase option contracts that mature within three months. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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