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Notional Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Net investment hedge | Euro notes    
Derivative [Line Items]    
Notional Amount $ 4,471 $ 3,932
Net investment hedge | Pound sterling notes    
Derivative [Line Items]    
Notional Amount 1,210 545
Net investment hedge | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 694  
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 3,657 3,640
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 1,660 6,681
Commodity contracts    
Derivative [Line Items]    
Notional Amount 617 1,569
Interest rate contracts    
Derivative [Line Items]    
Notional Amount $ 3,051 $ 3,970