XML 97 R87.htm IDEA: XBRL DOCUMENT v3.21.1
Derivative Financial Instruments - Gains and Losses on Derivative Instruments Held For Trading Purpose (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives $ 401 $ 112
Trading revenue [Member] | Interest rate contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives 429 17
Trading revenue [Member] | Foreign exchange contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives 116 (665)
Trading revenue [Member] | Equity contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives (279) 1,257
Trading revenue [Member] | Precious metals contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives (80) 160
Trading revenue [Member] | Credit contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives $ 215 $ (657)