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Loans and Leases - Schedule of Loans by Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | $ 62,445 |  | $ 61,292 |  |  |
Allowance for loan and lease losses | (823) | $ (821) | (773) | $ (760) | $ (737) | $ (685)
Net loans and leases | 61,622 |  | 60,519 |  |  |
Commercial: | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 29,848 |  | 30,609 |  |  |
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 |  | 1,200 |  |  |
Commercial: | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 3,244 |  | 2,024 |  |  |
Commercial: | Commercial, financial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 33,092 |  | 32,633 |  |  |
Allowance for loan and lease losses | (352) | (344) | (339) | (335) | (326) | (308)
Commercial: | Commercial, financial and industrial | Paycheck Protection Plan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 15 |  | 29 | 35 |  |
Commercial: | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 14,705 |  | 14,216 |  |  |
Allowance for loan and lease losses | (218) | (221) | (172) | (169) | (159) | (146)
Commercial: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 184 |  | 180 |  |  |
Consumer: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 13,961 |  | 13,650 |  |  |
Consumer: | Home Equity Line of Credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 2,085 |  | 2,219 |  |  |
Consumer: | Real estate installment loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 11,876 |  | 11,431 |  |  |
Consumer: | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 687 |  | 793 |  |  |
Allowance for loan and lease losses | $ (23) | $ (25) | $ (29) | $ (28) | $ (31) | $ (31)

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