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Loans and Leases - Schedule of Loans by Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | $ 63,058 |  | $ 62,565 |  |  |
Allowance for loan and lease losses | (777) | $ (814) | (815) | $ (823) | $ (821) | $ (773)
Net loans and leases | 62,281 |  | 61,750 |  |  |
Commercial: | Commercial, financial, and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 34,401 |  | 33,428 |  |  |
Allowance for loan and lease losses | (334) | (347) | (345) | (352) | (344) | (339)
Commercial: | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 30,475 |  | 29,957 |  |  |
Commercial: | Commercial and industrial | Equipment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Property, plant, and equipment and finance lease right-of-use asset | 1,500 |  | 1,400 |  |  |
Commercial: | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 3,926 |  | 3,471 |  |  |
Commercial: | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 13,675 |  | 14,421 |  |  |
Allowance for loan and lease losses | (204) | (213) | (227) | (218) | (221) | (172)
Commercial: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 154 |  | 174 |  |  |
Consumer: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 14,403 |  | 14,047 |  |  |
Consumer: | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 2,145 |  | 2,092 |  |  |
Consumer: | Real estate installment loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 12,258 |  | 11,955 |  |  |
Consumer: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 579 |  | 669 |  |  |
Allowance for loan and lease losses | $ (20) | $ (21) | $ (22) | $ (23) | $ (25) | $ (29)

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