Annual report [Section 13 and 15(d), not S-K Item 405]

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 ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale $ 9,545,000,000 $ 6,002,000,000  
Originations and purchases 36,198,000,000 15,621,000,000 $ 24,862,000,000
Net non-cash transfers into LHFS 0 632,000,000 1,900,000,000
Accrued interest receivable $ 4,300,000,000 $ 4,500,000,000  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Receivables Other Receivables  
Credit card lines      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest and fee income reversed $ 856,000,000 $ 584,000,000  
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value     1,900,000,000
Lending commitments     358,000,000
Commitments in payment default     105,000,000
Loans held for sale 9,500,000,000 6,000,000,000.0  
Proceeds from sales and paydowns of loans originally classified as LHFS 32,300,000,000 16,300,000,000 32,000,000,000.0
Originations and purchases $ 36,200,000,000 $ 15,600,000,000 $ 24,900,000,000