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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest | $ 281 | $ 281 |  | $ 287
Net loans and leases | 61,622 | 61,622 |  | 60,519
Loans and leases | $ 62,445 | 62,445 |  | 61,292
Financing receivable, allowance for credit loss, writeoff, collateral |  | $ 1 | $ 1 |
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 (current year less than) |  | $ 1 | $ 21 |
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 | $ 3,244 | $ 3,244 |  | 2,024
Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 33,092 | 33,092 |  | 32,633
Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 14,705 | 14,705 |  | 14,216
Finance and Insurance Companies | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 3,700 | $ 3,700 |  |
Financial Services Industry Loans | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage contributed | 21.00% | 21.00% |  |
General C I | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 376 | $ 376 |  | 250
General C I | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 29,848 | 29,848 |  | 30,609
General C I | Commercial: | Commercial and industrial | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 134 | 134 |  |
Commercial Real Estate | Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 14,705 | 14,705 |  | 14,216
Commercial Real Estate | Commercial: | Commercial real estate | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 242 | 242 |  |
Asset Pledged as Collateral |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net loans and leases | 46,600 | 46,600 |  | 46,100
Asset Pledged as Collateral | General C I |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, writeoff, collateral | 27 | 67 |  |
Asset Pledged as Collateral | Home Equity Line of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 6 | 6 |  | 6
Asset Pledged as Collateral | R E Installment Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 28 | $ 28 |  | $ 27

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