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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (8) $ 219 $ 188 $ 219
Pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI 30 $ 37 17 $ 14
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ 18   $ (13)