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Derivative Instruments Fair Value and Measurement Inputs (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ (399) | $ 34
Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 3 | (3)
Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (185) | (60)
Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (217) | 97
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (175) | (86)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (175) | (86)
Significant Other Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (224) | 120
Significant Other Observable Inputs (Level 2) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 3 | (3)
Significant Other Observable Inputs (Level 2) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (10) | 26
Significant Other Observable Inputs (Level 2) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ (217) | $ 97

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