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Location on the Balance Sheet of Derivative Assets and Liabilities (Detail) - Fair Value, Inputs, Level 2 - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Asset Derivatives    
Asset Derivatives $ 179 $ 107
Net Amounts if Right of Offset had been Applied 108 87
Derivative Liabilities [Abstract]    
Liability Derivatives 151 332
Net Amounts if Right of Offset had been Applied 80 312
Designated as Hedging Instrument | Foreign exchange contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 46 2
Net Amounts if Right of Offset had been Applied 22 0
Designated as Hedging Instrument | Foreign exchange contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 87 1
Net Amounts if Right of Offset had been Applied 51 0
Designated as Hedging Instrument | Foreign exchange contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 35 93
Net Amounts if Right of Offset had been Applied 11 91
Designated as Hedging Instrument | Foreign exchange contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 54 194
Net Amounts if Right of Offset had been Applied 18 193
Designated as Hedging Instrument | Interest rate contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 6 1
Net Amounts if Right of Offset had been Applied 6 1
Designated as Hedging Instrument | Interest rate contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 14 59
Net Amounts if Right of Offset had been Applied 3 43
Designated as Hedging Instrument | Interest rate contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 60 28
Net Amounts if Right of Offset had been Applied 49 12
Not Designated as Hedging Instrument | Foreign exchange contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 3 18
Net Amounts if Right of Offset had been Applied 3 17
Not Designated as Hedging Instrument | Foreign exchange contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 1 0
Net Amounts if Right of Offset had been Applied 1 0
Not Designated as Hedging Instrument | Foreign exchange contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 1 1
Net Amounts if Right of Offset had been Applied 1 0
Not Designated as Hedging Instrument | Foreign exchange contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 1 0
Net Amounts if Right of Offset had been Applied 1 0
Not Designated as Hedging Instrument | Interest rate contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 22 26
Net Amounts if Right of Offset had been Applied 22 26
Not Designated as Hedging Instrument | Investment market price contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 0 16
Net Amounts if Right of Offset had been Applied $ 0 $ 16