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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (38) $ (8) $ (110) $ 188
Pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI 21 30 107 17
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (4) $ 18 $ (33) $ (13)