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Derivative Financial Instruments - Gains and Losses on Derivative Instruments Held For Trading Purpose (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes $ 95 $ 54 $ 486
Trading revenue [Member] | Interest rate contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes (209) (283) 899
Trading revenue [Member] | Foreign exchange contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes 192 386 (472)
Trading revenue [Member] | Equity contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes 2 6 4
Trading revenue [Member] | Precious metals contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes 220 (20) 52
Trading revenue [Member] | Credit contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes (110) (71) (23)
Residential mortgage banking revenue (expense) [Member] | Interest rate contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives held for trading purposes $ 0 $ 36 $ 26