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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest | $ 294 | $ 294 |  | $ 287
Net loans and leases | 61,960 | 61,960 |  | 60,519
Loans and leases | $ 62,781 | 62,781 |  | 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 |  | $ 8 | $ 25 |
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: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 33,452 | $ 33,452 |  | 32,633
Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 14,669 | 14,669 |  | 14,216
Loans to mortgage companies | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 2,934 | $ 2,934 |  | 2,024
Percentage contributed | 20.00% | 20.00% |  |
Finance And Insurance Companies | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 3,800 | $ 3,800 |  |
General C I | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 310 | 310 |  | 250
General C I | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 30,518 | 30,518 |  | 30,609
General C I | Commercial: | Commercial and industrial | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 121 | 121 |  |
Commercial Real Estate | Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 14,669 | 14,669 |  | 14,216
Commercial Real Estate | Commercial: | Commercial real estate | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 189 | 189 |  |
Asset Pledged as Collateral |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net loans and leases | 46,500 | 46,500 |  | 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 | 19 | 40 |  |
Asset Pledged as Collateral | Home Equity Line of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 7 | 7 |  | 6
Asset Pledged as Collateral | R E Installment Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 27 | $ 27 |  | $ 27

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