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
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period decrease     $ (180)  
Allowance for credit losses     14,371 $ 13,951
Loan and leases receivable, allowance, period decrease     129  
Reserve for unfunded lending commitments, period decrease     51  
Increase in provision for credit losses     388  
Provision (benefit) for credit losses     1,319 931
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     (3,900)  
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 1.70% 0.60%    
Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period decrease     (111)  
Allowance for credit losses     5,838 6,497
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     1,700  
Consumer Portfolio Segment        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period decrease     (69)  
Consumer real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period decrease     (56)  
Allowance for credit losses     412 496
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     (5,700)  
Credit card and other consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, period decrease     (13)  
Allowance for credit losses     $ 8,121 $ 6,958