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Hedges of Net Investments in International Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Euro notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) recognized in OCI $ (323) $ 73 $ 268
Pound sterling notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) recognized in OCI (26) 148 42
Swiss franc notes      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains / (losses) recognized in OCI $ (49) $ 12 $ 9