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Loan Sale and Servicing Activities and Variable Interest Entities (Loan Sale and Servicing Activities and Variable Interest Entities) (Narrative) (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Billions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment Program, Proportional Amortization Method, Applied, Amortization Expense | $ 0.4 | $ 0.3
Low Income Housing Tax Credit And Market Tax Credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Tax credits | 0.4 | 0.3
Other tax benefits (less than in current period) | $ 0.1 | $ 0.1

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