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Loans and Leases - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | $ 61,778 |  | $ 58,102 |  |  |
Allowance for loan and lease losses | (760) | $ (737) | (685) | $ (664) | $ (624) | $ (670)
Net loans and leases | 61,018 |  | 57,417 |  |  |
Equipment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Property, plant, and equipment and finance lease right-of-use asset | 1,200 |  | 1,100 |  |  |
Commercial: | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 30,926 |  | 29,523 |  |  |
Commercial: | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 2,237 |  | 2,258 |  |  |
Commercial: | Commercial, financial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 33,163 |  | 31,781 |  |  |
Allowance for loan and lease losses | (335) | (326) | (308) | (295) | (274) | (334)
Commercial: | Commercial, financial and industrial | Paycheck Protection Plan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 35 |  | 76 | 129 |  |
Commercial: | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 14,121 |  | 13,228 |  |  |
Allowance for loan and lease losses | (169) | (159) | (146) | (148) | (141) | (154)
Commercial: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 187 |  | 193 |  |  |
Consumer: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 13,685 |  | 12,253 |  |  |
Consumer: | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 2,248 |  | 2,028 |  |  |
Consumer: | Real estate installment loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 11,437 |  | 10,225 |  |  |
Consumer: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 809 |  | 840 |  |  |
Allowance for loan and lease losses | $ (28) | $ (31) | $ (31) | $ (28) | $ (26) | $ (19)

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