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Derivative Instruments Fair Value and Measurement Inputs (Detail) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ (6) | $ 629
Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 57 | 763
Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (31) | (125)
Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (32) | (9)
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (7) | (49)
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (7) | (49)
Significant Other Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 1 | 678
Significant Other Observable Inputs (Level 2) | Currency exchange contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | 57 | 763
Significant Other Observable Inputs (Level 2) | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | (24) | (76)
Significant Other Observable Inputs (Level 2) | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative fair value net asset (liability) | $ (32) | $ (9)

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