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Notional Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Net investment hedge | Euro notes    
Derivative [Line Items]    
Notional Amount $ 3,679 $ 4,012
Net investment hedge | Pound sterling notes    
Derivative [Line Items]    
Notional Amount 459 419
Net investment hedge | Swiss franc notes    
Derivative [Line Items]    
Notional Amount 1,694 1,447
Currency exchange contracts | Intercompany loans and forecasted interest payments    
Derivative [Line Items]    
Notional Amount 7,089 3,343
Currency exchange contracts | Forecasted transactions    
Derivative [Line Items]    
Notional Amount 2,213 1,452
Commodity contracts    
Derivative [Line Items]    
Notional Amount 1,204 837
Interest rate contracts    
Derivative [Line Items]    
Notional Amount $ 6,532 $ 6,365