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, 2026
Dec. 31, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         $ (200)  
Allowance for credit losses     $ 14,351 $ 14,640 14,351 $ 14,640
Loan and leases receivable, allowance, period decrease         91  
Reserve for unfunded lending commitments, period decrease         109  
Increase in provision for credit losses     308   1,100  
Provision (benefit) for credit losses     1,542 1,234 4,369 3,290
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         21,500  
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 1.90% 1.40%        
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         (249)  
Allowance for credit losses     5,700 6,388 5,700 6,388
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         21,200  
Consumer real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         (101)  
Allowance for credit losses     367 497 367 497
Credit card and other consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         150  
Allowance for credit losses     $ 8,284 $ 7,755 $ 8,284 $ 7,755