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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)