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Financial Instruments Notional Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Notional Amount | $ 125 | $ 587
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Notional Amount | 3,159 | 3,922
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Notional Amount | $ 12 | $ 6

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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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