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Derivative Financial Instruments - Amounts Related to Derivative Instruments Not Designated as Hedges (Details) - Not designated as hedges - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income $ 242 $ (233) $ 409 $ (164)
Client-related and other risk management: | Interest rate contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income 25 10 58 21
Client-related and other risk management: | Foreign exchange contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income 55 (164) 121 (213)
Client-related and other risk management: | Equity contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income 212 (38) 250 15
Client-related and other risk management: | Credit contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income (26) (26) (11) (12)
Client-related and other risk management: | Commodity contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income 2 3 6 6
MSRs and mortgage banking: | Interest rate contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-tax gain (loss) recognized in income $ (26) $ (18) $ (15) $ 19