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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest | $ 262 | $ 262 |  | $ 271
Net loans and leases | 62,281 | 62,281 |  | 61,750
Loans and leases | $ 63,058 | $ 63,058 |  | 62,565
Credit Card Workout Program rate reduction, interest rate floor |  | 0.00% |  |
Credit Card Workout Program term extension, maximum period |  | 5 years |  |
Loans modified with subsequent default, amount |  | $ 21 | $ 1 |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit Card Hardship Program, rate and payment reduction, period |  | 6 months |  |
Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit Card Hardship Program, rate and payment reduction, period |  | 1 year |  |
Commercial: | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loan grades | 1 | 1 |  |
Commercial: | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commercial loan grades | 16 | 16 |  |
Commercial: | Loans to mortgage companies |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 3,926 | $ 3,926 |  | 3,471
Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 34,401 | 34,401 |  | 33,428
Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 13,675 | 13,675 |  | 14,421
Finance and Insurance Companies | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 3,900 | $ 3,900 |  |
Financial Services Industry Loans | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage contributed | 22.00% | 22.00% |  |
C&I | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 430 | $ 430 |  | 352
C&I | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 30,475 | 30,475 |  | 29,957
C&I | Commercial: | Commercial and industrial | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 177 | 177 |  |
Commercial Real Estate | Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 13,675 | 13,675 |  | 14,421
Commercial Real Estate | Commercial: | Commercial real estate | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 253 | 253 |  |
Asset Pledged as Collateral |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net loans and leases | 45,700 | 45,700 |  | 45,800
Asset Pledged as Collateral | C&I |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, writeoff, collateral | 15 | 52 |  |
Asset Pledged as Collateral | Home Equity Line of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 6 | 6 |  | 6
Financing receivable, allowance for credit loss, writeoff, collateral |  | 2 | $ 1 |
Asset Pledged as Collateral | R E Installment Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 41 | $ 41 |  | $ 36

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