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, 2025
Dec. 31, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         $ (209)  
Allowance for credit losses     $ 14,342 $ 14,338 14,342 $ 14,338
Loan and leases receivable, allowance, period decrease         104  
Reserve for unfunded lending commitments, period decrease         105  
Increase in provision for credit losses     383   771  
Provision (benefit) for credit losses     1,508 1,125 2,827 2,056
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         3,400  
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 1.50% 1.00%        
Consumer Portfolio Segment            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         (33)  
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         (176)  
Allowance for credit losses     5,773 6,502 5,773 6,502
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         6,400  
Consumer real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         (66)  
Allowance for credit losses     402 513 402 513
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         (3,000)  
Credit card and other consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses, period increase (decrease)         33  
Allowance for credit losses     $ 8,167 $ 7,323 $ 8,167 $ 7,323