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Economic Hedges (Detail) (Derivatives Not Designated as Hedging Instruments, Economic Hedging, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings $ 20 $ 22
Interest rate contracts | Interest And Other Expense
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings   (2)
Commodity contracts | Cost of sales
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings 38 17
Forecasted Purchases Hedges | Foreign exchange contracts | Cost of sales
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings (10) (12)
Forecasted transactions | Foreign exchange contracts | Interest And Other Expense
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings (5)  
Forecasted transactions | Foreign exchange contracts | Selling, general and administrative expenses
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings (1) (1)
Forecasted Interest Payments | Intercompany loans | Foreign exchange contracts | Interest And Other Expense
    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (Loss) Recognized in Earnings $ (2) $ 20