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Location on the Balance Sheet of Derivative Assets and Liabilities (Detail) - Fair Value, Inputs, Level 2 - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Asset Derivatives    
Asset Derivatives $ 90 $ 107
Net Amounts if Right of Offset had been Applied 58 87
Derivative Liabilities [Abstract]    
Liability Derivatives 466 332
Net Amounts if Right of Offset had been Applied 434 312
Designated as Hedging Instrument | Foreign exchange contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 4 2
Net Amounts if Right of Offset had been Applied 0 0
Designated as Hedging Instrument | Foreign exchange contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 9 1
Net Amounts if Right of Offset had been Applied 0 0
Designated as Hedging Instrument | Foreign exchange contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 144 93
Net Amounts if Right of Offset had been Applied 140 91
Designated as Hedging Instrument | Foreign exchange contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 249 194
Net Amounts if Right of Offset had been Applied 240 193
Designated as Hedging Instrument | Interest rate contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 0 1
Net Amounts if Right of Offset had been Applied 0 1
Designated as Hedging Instrument | Interest rate contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 31 59
Net Amounts if Right of Offset had been Applied 10 43
Designated as Hedging Instrument | Interest rate contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 0 0
Net Amounts if Right of Offset had been Applied 0 0
Designated as Hedging Instrument | Interest rate contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 51 28
Net Amounts if Right of Offset had been Applied 30 12
Not Designated as Hedging Instrument | Foreign exchange contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 14 18
Net Amounts if Right of Offset had been Applied 16 17
Not Designated as Hedging Instrument | Foreign exchange contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 8 0
Net Amounts if Right of Offset had been Applied 8 0
Not Designated as Hedging Instrument | Foreign exchange contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 15 1
Net Amounts if Right of Offset had been Applied 17 0
Not Designated as Hedging Instrument | Foreign exchange contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 7 0
Net Amounts if Right of Offset had been Applied 7 0
Not Designated as Hedging Instrument | Interest rate contracts | Other non-current assets    
Asset Derivatives    
Asset Derivatives 24 26
Net Amounts if Right of Offset had been Applied 24 26
Not Designated as Hedging Instrument | Interest rate contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 0 0
Net Amounts if Right of Offset had been Applied 0 0
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