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Notional Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Net Investment Hedging | Euro Notes    
Derivative [Line Items]    
Notional Amount $ 4,459 $ 3,932
Net Investment Hedging | Pound Sterling Notes    
Derivative [Line Items]    
Notional Amount 1,257 545
Net Investment Hedging | Franc Notes    
Derivative [Line Items]    
Notional Amount 722  
Currency exchange contracts | Intercompany Loans And Forecasted Interest Payments    
Derivative [Line Items]    
Notional Amount 5,680 3,640
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 7,762 6,681
Commodity contracts    
Derivative [Line Items]    
Notional Amount 2,903 1,569
Interest rate contracts    
Derivative [Line Items]    
Notional Amount $ 3,078 $ 3,970