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Hedges of Net Investments in International Operations (Detail) - Net investment hedge - Currency Translation Adjustments - Currency exchange contracts - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Euro notes    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) recognized in OCI $ 154 $ 314
Pound sterling notes    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) recognized in OCI (23) 32
Swiss franc notes    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) recognized in OCI $ 43 $ (13)