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Derivative and Other Financial Instruments (Notional Values of Outstanding Derivative Instruments in the Consolidated Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives designated as hedges | Derivatives in cash flow hedges | Foreign exchange |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | $ 864 | $ 644
Derivatives designated as hedges | Derivatives in cash flow hedges | Commodities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 276 | 180
Derivatives designated as hedges | Derivatives in fair value hedges | Foreign exchange |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 60 | 73
Derivatives not designated as hedges | Foreign exchange |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | 575 | 618
Derivatives not designated as hedges | Commodities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives | $ 40 | $ 72

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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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