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Loans and Leases - Schedule of Loans by Portfolio Segment (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | $ 63,260 |  | $ 62,565 |  |  |
Allowance for loan and lease losses | (814) | $ (822) | (815) | $ (821) | $ (787) | $ (773)
Net loans and leases | 62,446 |  | 61,750 |  |  |
Commercial: | Commercial, financial, and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 34,359 |  | 33,428 |  |  |
Allowance for loan and lease losses | (347) | (345) | (345) | (344) | (348) | (339)
Commercial: | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 30,301 |  | 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 | 1,400 |  | 1,400 |  |  |
Commercial: | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 4,058 |  | 3,471 |  |  |
Commercial: | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 13,936 |  | 14,421 |  |  |
Allowance for loan and lease losses | (213) | (225) | (227) | (221) | (181) | (172)
Commercial: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 162 |  | 174 |  |  |
Consumer: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 14,368 |  | 14,047 |  |  |
Consumer: | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 2,128 |  | 2,092 |  |  |
Consumer: | Real estate installment loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 12,240 |  | 11,955 |  |  |
Consumer: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 597 |  | 669 |  |  |
Allowance for loan and lease losses | $ (21) | $ (22) | $ (22) | $ (25) | $ (27) | $ (29)

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