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Notional Values of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Net Investment Hedging | Euro Notes
   
Derivative [Line Items]    
Notional Amount $ 4,475 $ 4,466
Net Investment Hedging | Pound Sterling Notes
   
Derivative [Line Items]    
Notional Amount 1,083 1,076
Foreign exchange contracts | Intercompany Loans And Forecasted Interest Payments
   
Derivative [Line Items]    
Notional Amount 4,317 4,369
Foreign exchange contracts | Forecasted transactions
   
Derivative [Line Items]    
Notional Amount 2,205 2,565
Commodity contracts
   
Derivative [Line Items]    
Notional Amount 796 805
Interest rate contracts
   
Derivative [Line Items]    
Notional Amount $ 2,278 $ 2,273