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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 6,535   $ 6,535   $ 5,165
Accrued interest receivable $ 4,200   $ 4,200   $ 4,200
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 $ 216 $ 218 $ 438 $ 449  
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 6,500   6,500   $ 5,200
Proceeds from sales and paydowns of loans originally classified as LHFS     20,100 20,400  
Originations and purchases     21,600 15,400  
Commercial | United States          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Subsequent default for loans modified within the last 12 months     $ 154 $ 234  
Commercial | Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Weighted-average duration 1 year 7 months 6 days 10 months 1 year 9 months 18 days 1 year 3 months 18 days  
Lending commitments $ 960 $ 434 $ 960 $ 434  
Commercial | Commercial loans | Forbearance Program          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Weighted-average duration 11 months 1 year 2 months 12 days 1 year 1 year 3 months 18 days  
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     2 years