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Location on the Balance Sheet of Derivative Assets and Liabilities (Detail) - Fair Value, Inputs, Level 2 - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Asset Derivatives    
Asset Derivatives $ 686 $ 768
Derivative Asset, Fair Value, Net 655 738
Derivative Liabilities [Abstract]    
Liability Derivatives 69 53
Derivative Liability, Fair Value, Amount Offset Against Collateral 38 23
Designated as Hedging Instrument | Foreign Exchange Contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 174 408
Derivative Asset, Fair Value, Net 173 408
Designated as Hedging Instrument | Foreign Exchange Contracts | Other noncurrent assets    
Asset Derivatives    
Asset Derivatives 37 92
Derivative Asset, Fair Value, Net 31 92
Designated as Hedging Instrument | Foreign Exchange Contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 2 0
Derivative Liability, Fair Value, Amount Offset Against Collateral 1 0
Designated as Hedging Instrument | Foreign Exchange Contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 19 0
Derivative Liability, Fair Value, Amount Offset Against Collateral 13 0
Designated as Hedging Instrument | Interest Rate Contracts | Other noncurrent assets    
Asset Derivatives    
Asset Derivatives 254 204
Derivative Asset, Fair Value, Net 238 185
Designated as Hedging Instrument | Interest Rate Contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 16 19
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Other current assets    
Asset Derivatives    
Asset Derivatives 1 2
Derivative Asset, Fair Value, Net 1 0
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 2 12
Derivative Liability, Fair Value, Amount Offset Against Collateral 2 10
Not Designated as Hedging Instrument | Price Risk Derivative [Member] | Other current assets    
Asset Derivatives    
Asset Derivatives 153 5
Derivative Asset, Fair Value, Net 153 0
Not Designated as Hedging Instrument | Price Risk Derivative [Member] | Other current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 0 9
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 4
Not Designated as Hedging Instrument | Interest Rate Contracts | Other noncurrent assets    
Asset Derivatives    
Asset Derivatives 67 57
Derivative Asset, Fair Value, Net 59 53
Not Designated as Hedging Instrument | Interest Rate Contracts | Other non-current liabilities    
Derivative Liabilities [Abstract]    
Liability Derivatives 30 13
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 22 $ 9