Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Allowance for credit losses, period increase (decrease)         $ 418          
Allowance for credit losses     $ 14,640 $ 13,817 14,640 $ 13,817        
Decrease to allowance for credit losses     (13,287) (12,302) (13,287) (12,302) $ (12,950) $ (12,682) $ (11,973) $ (12,387)
Loan and leases receivable, allowance, period increase (decrease)         605          
Reserve for unfunded lending commitments, period decrease         187          
Increase in provision for credit losses     336   1,800          
Provision for credit losses     1,234 898 3,290 1,451        
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         4,900          
Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Decrease to allowance for credit losses               243    
Scenario, Forecast                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Unemployment rate, current economic outlook 5.00% 5.00%                
U.S. gross domestic product, current economic outlook 1.60% 0.50%                
Consumer real estate                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Allowance for credit losses, period increase (decrease)         921          
Allowance for credit losses     497 462 497 462        
Decrease to allowance for credit losses     (412) (384) (412) (384) (427) (420) (396) (557)
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         2,500          
Consumer real estate | Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Decrease to allowance for credit losses               67    
Commercial                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Allowance for credit losses, period increase (decrease)         (503)          
Allowance for credit losses     6,388 6,859 6,388 6,859        
Decrease to allowance for credit losses     (5,120) (5,422) (5,120) (5,422) (5,200) (5,445) (5,361) (5,354)
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         2,400          
Commercial | Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Decrease to allowance for credit losses               67    
Credit card and other consumer                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Allowance for credit losses     7,755 6,496 7,755 6,496        
Decrease to allowance for credit losses     $ (7,755) $ (6,496) $ (7,755) $ (6,496) $ (7,323) (6,817) $ (6,216) $ (6,476)
Credit card and other consumer | Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Decrease to allowance for credit losses               $ 109