Quarterly report [Sections 13 or 15(d)]

Outstanding Loans and Leases and Allowance for Credit Losses - Commercial Loans, Loans Held-for-sale and Accrued Interest Receivable (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Commercial Loans, Loans Held-for-sale and Accrued Interest Receivable (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 6,831   $ 6,831   $ 9,545
Accrued interest receivable $ 4,300   $ 4,300   $ 4,300
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Receivables   Other Receivables   Other Receivables
Consumer and Small Business Credit Card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest and fee income reversed $ 209 $ 213 $ 658 $ 633  
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 6,800   6,800   $ 9,500
Proceeds from sales and paydowns of loans originally classified as LHFS     27,000 21,700  
Originations and purchases     $ 23,400 $ 26,300  
Commercial | Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Weighted-average duration 1 year 2 years 1 month 6 days 1 year 4 months 24 days 1 year 9 months 18 days  
Lending commitments $ 658 $ 1,200 $ 658 $ 1,200  
Commercial | Commercial loans | Forbearance Program          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Weighted-average duration 17 months 10 months 13 months 11 months  
Commercial | Commercial loans | Forbearances | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Weighted-average duration     8 months    
Commercial | Commercial loans | Forbearances | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Weighted-average duration     24 months