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Financial Instruments - Foreign Exchange Risk Management (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | $ 160 | $ 207
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months | 76.00% |
Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months | 9.00% |
Average Maturity of Foreign Exchange Hedging Contracts - within Six and Twelve Months | 12.00% |
Average Maturity of Foreign Exchange Hedging Contracts - greater than twelve months | 3.00% |

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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 Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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