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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
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 Six and Twelve Months

+ References

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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.

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Average Maturity of Foreign Exchange Hedging Contracts - within Three Months. Outstanding average forward exchange and purchase option contracts that mature within three months.

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Average Maturity of Foreign Exchange Hedging Contracts - greater than twelve months

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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

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