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Derivative and Other Financial Instruments - Notional Values of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Foreign exchange | Derivatives not designated as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative | $ 586 | $ 575
Foreign exchange | Derivatives in cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative | 839 | 864
Foreign exchange | Derivatives in fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative | 70 | 60
Commodities | Derivatives not designated as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative | 0 | 40
Commodities | Derivatives in cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of derivative | $ 335 | $ 276

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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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