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Hedges of Net Investments in International Operations (Detail) - Net Investment Hedging - Currency Translation Adjustments - Currency exchange contracts - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Euro Notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (118) $ 5 $ 196  
Pound Sterling Notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI (45) $ (19) (13) $ (23)
Franc Notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (17)   $ (30)