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Loan Sale and Servicing Activities and Variable Interest Entities (Loan Sale and Servicing Activities and Variable Interest Entities) (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Low Income Housing Tax Credit Investments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortization |  | $ 300
Tax credits |  | 300
Other tax benefits |  | $ 100
Low Income Housing Tax Credit And Market Tax Credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortization | $ 300 |
Tax credits | 300 |
Other tax benefits | $ 100 |

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