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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest | $ 283 |  | $ 287
Net loans and leases | 60,966 |  | 60,519
Loans and leases | 61,753 |  | 61,292
Allowance for credit loss, writeoff, collateral | 0 | $ 0 |
Modified in period, amount | $ 1 | $ 0 |
Commercial: | Minimum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial loan grades | 1 |  |
Commercial: | Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial loan grades | 16 |  |
Commercial: | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 32,911 |  | 32,633
Commercial: | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 14,426 |  | 14,216
Loans to mortgage companies | Commercial: | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 2,366 |  | 2,024
Percentage contributed | 19.00% |  |
Finance And Insurance Companies | Commercial: | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 3,800 |  |
General C I | Collateral Pledged |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 264 |  | 250
General C I | Commercial: | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 30,545 |  | 30,609
General C I | Commercial: | Commercial and industrial | Collateral Pledged |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 145 |  |
Commercial Real Estate | Commercial: | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 14,426 |  | 14,216
Commercial Real Estate | Commercial: | Commercial real estate | Collateral Pledged |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 119 |  |
Asset Pledged as Collateral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net loans and leases | 50,100 |  | 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 | 22 |  |
Asset Pledged as Collateral | Home Equity Line of Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 6 |  | 6
Asset Pledged as Collateral | R E Installment Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 26 |  | $ 27

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