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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative asset amounts that could be net settled $ 349 $ 114  
Derivative liability amounts that could be net settled 47 88  
Interest rate contracts
      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged forecasted transactions 32 years 2 months    
Commodity contracts
      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged forecasted transactions 12 months    
Foreign exchange contracts
      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged forecasted transactions 12 months    
Cash Flow Hedges
      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized loss in interest and other expenses, net   (556) (173)
Cash Flow Hedges | Interest rate contracts
      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized loss in interest and other expenses, net   (556) (156)
Recognized loss, related to several interest rate swaps     157
Expected transfers of unrealized losses to earnings, within next 12 months (1)    
Cash Flow Hedges | Commodity contracts
      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized loss in interest and other expenses, net     (17)
Expected transfers of unrealized losses to earnings, within next 12 months (2)    
Cash Flow Hedges | Foreign exchange contracts
      
Derivative Instruments, Gain (Loss) [Line Items]      
Expected transfers of unrealized losses to earnings, within next 12 months (6)    
Exchange Traded Options
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative asset amounts that could be net settled 7    
Exchange Traded Options | Other Current Assets
      
Derivative Instruments, Gain (Loss) [Line Items]      
Margin deposits related to exchange traded derivatives $ 22 $ 107