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Derivative Financial Instruments - Gains and Losses on Derivative Instruments Held For Other Purpose (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes $ (507) $ 340
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes (516) 357
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Interest rate contracts [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes (162) 3
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Foreign exchange contracts [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes (2) 9
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Equity contracts [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes (339) 360
Other Income [Member] | Credit contracts [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes (2) (32)
Other Income [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Income on Derivatives held for other purposes [1] $ (2) $ 0
[1] Consists of swap agreements entered into in conjunction with the sales of certain Visa Class B Shares.