Quarterly report [Sections 13 or 15(d)]

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

v3.25.2
Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 15 Months Ended
Dec. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2026
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses, period increase (decrease)         $ 98    
Allowance for credit losses     $ 14,434 $ 14,342 14,434 $ 14,342  
Loan and leases receivable, allowance, period increase         51    
Reserve for unfunded lending commitments, period increase         47    
Increase in provision for credit losses     84   245    
Provision (benefit) for credit losses     1,592 1,508 3,072 2,827  
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         48,600    
Scenario, Forecast              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Unemployment rate, current economic outlook (just below)             5.00%
U.S. gross domestic product, current economic outlook (as a percent) 1.50% 0.20%          
Commercial              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses, period increase (decrease)         89    
Allowance for credit losses     5,798 5,773 5,798 5,773  
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         40,800    
Consumer real estate              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses, period increase (decrease)         54    
Allowance for credit losses     404 402 404 402  
Credit card and other consumer              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses, period increase (decrease)         (45)    
Allowance for credit losses     $ 8,232 $ 8,167 8,232 $ 8,167  
Outstanding loans and leases, period increase, excluding loans accounted for under the fair value option         $ 7,800