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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest | $ 276 | $ 276 |  | $ 226
Net loans and leases | 61,018 | 61,018 |  | 57,417
Loans and leases | $ 61,778 | 61,778 |  | 58,102
Allowance for credit loss, writeoff, collateral |  | 1 | $ 2 |
Post-Modification Outstanding Recorded Investment |  | $ 21 |  | 85
TDR loans balance |  |  |  | 180
Loans Held For Sale, Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
TDR loans balance |  |  |  | 30
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 | $ 33,163 | $ 33,163 |  | 31,781
Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 14,121 | 14,121 |  | 13,228
Loans to mortgage companies | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 2,237 | $ 2,237 |  | 2,258
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 | $ 4,200 | $ 4,200 |  |
C&I | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 245 | 245 |  | 124
C&I | Commercial: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 30,926 | 30,926 |  | 29,523
Post-Modification Outstanding Recorded Investment |  |  |  | 24
C&I | Commercial: | Commercial and industrial | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 120 | 120 |  |
CRE | Commercial: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 14,121 | 14,121 |  | 13,228
CRE | Commercial: | Commercial real estate | Collateral Pledged |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 125 | 125 |  |
Asset Pledged as Collateral |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net loans and leases | 47,800 | 47,800 |  | 38,300
Asset Pledged as Collateral | C&I |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, allowance for credit loss, writeoff, collateral | 82 | 106 |  |
Asset Pledged as Collateral | HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 6 | 6 |  | 7
Asset Pledged as Collateral | Real estate installment loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 28 | $ 28 |  | $ 26

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