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Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Amortized Cost Basis of the Bancorp's Collateral Dependent Loans (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Impaired |  |
Total portfolio loans and leases | $ 601 | $ 622
Commercial |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 359 | 395
Commercial | Commercial and industrial loans |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 328 | 325
Commercial | Commercial mortgage owner-occupied loans |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 26 | 63
Commercial | Commercial mortgage nonowner-occupied loans |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 5 | 4
Commercial | Commercial construction loans |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 0 | 1
Commercial | Commercial leases |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 0 | 2
Residential Mortgage |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 137 | 131
Consumer |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 105 | 96
Consumer | Home equity |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | 69 | 66
Consumer | Indirect secured consumer loans |  |
Financing Receivable, Impaired |  |
Loans and leases receivable, allowance for amortized cost basis | $ 36 | $ 30

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