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Hedges of Net Investments in International Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Euro notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (168) $ 82 $ (196) $ (72)
Pound sterling notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI (10) 63 (15) 86
Swiss franc notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ (49) $ 14 $ (64) $ (29)