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Hedges of Net Investments in International Operations (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Euro notes    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) recognized in OCI $ (29) $ 154
Pound sterling notes    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) recognized in OCI (5) (23)
Swiss franc notes    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains / (losses) recognized in OCI $ (15) $ 43