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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Loss related to interest rate swaps   $ (97)  
Interest rate contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged forecasted transactions 6 years 7 months    
Interest rate contracts | Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Loss related to interest rate swaps   $ (97)  
Interest rate contracts | Maximum | Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Expected transfers of unrealized gains (losses) to earnings, within next 12 months $ (1)    
Commodity contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged forecasted transactions 9 months    
Commodity contracts | Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Expected transfers of unrealized gains (losses) to earnings, within next 12 months $ (24)    
Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged forecasted transactions 9 months    
Currency exchange contracts | Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Expected transfers of unrealized gains (losses) to earnings, within next 12 months $ 10    
Quoted Prices In Active Markets For Identical Assets (Level 1)      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative liabilities after effects of netting     $ 2
Quoted Prices In Active Markets For Identical Assets (Level 1) | Exchange Traded Options      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative assets after effects of netting 49   48
Quoted Prices In Active Markets For Identical Assets (Level 1) | Exchange Traded Options | Other current assets      
Derivative Instruments, Gain (Loss) [Line Items]      
Margin deposits related to exchange traded derivatives 170   133
Significant Other Observable Inputs (Level 2)      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative assets after effects of netting 127   162
Derivative liabilities after effects of netting $ 47   $ 40