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Derivative Instruments Fair Value and Measurement Inputs (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ (646) | $ 34
Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (11) | (3)
Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (145) | (60)
Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (490) | 97
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (138) | (86)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (138) | (86)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (508) | 120
Significant Other Observable Inputs (Level 2) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (11) | (3)
Significant Other Observable Inputs (Level 2) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (7) | 26
Significant Other Observable Inputs (Level 2) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (490) | 97
Significant Unobservable Inputs (Level 3) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 0 | 0
Significant Unobservable Inputs (Level 3) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ 0 | $ 0

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