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 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Allowance for credit losses, period increase (decrease)         $ 116          
Allowance for credit losses     $ 14,338 $ 13,434 14,338 $ 13,434        
Decrease to allowance for credit losses     (12,950) (11,973) (12,950) (11,973) $ (12,514) $ (12,682) $ (12,104) $ (12,387)
Loan and leases receivable, allowance, period increase (decrease)         268          
Reserve for unfunded lending commitments, period decrease         152          
Increase in provision for credit losses     602   1,500          
Provision for credit losses     1,125 523 2,056 553        
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         6,900          
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% 4.50%                
U.S. gross domestic product, current economic outlook 1.00% 0.20%                
Unemployment rate, previous economic outlook 5.00% 5.50%                
U.S. gross domestic product, previous economic outlook 1.20% 0.40%                
Consumer real estate                    
Financing Receivable, Allowance for Credit Loss [Line Items]                    
Allowance for credit losses, period increase (decrease)         505          
Allowance for credit losses     513 475 513 475        
Decrease to allowance for credit losses     (427) (396) (427) (396) (403) (420) (473) (557)
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)         (389)          
Allowance for credit losses     6,502 6,743 6,502 6,743        
Decrease to allowance for credit losses     (5,200) (5,361) (5,200) (5,361) (5,153) (5,445) (5,389) (5,354)
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         7,000          
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     7,323 6,216 7,323 6,216        
Decrease to allowance for credit losses     $ (7,323) $ (6,216) $ (7,323) $ (6,216) $ (6,958) (6,817) $ (6,242) $ (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