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Loan Sale and Servicing Activities and Variable Interest Entities (Loan Sale and Servicing Activities and Variable Interest Entities) (Narrative) (Details) - Low Income Housing Tax Credit Investments - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortization | $ 200 |
Tax credits | 200 |
Amortization, tax credits, and other tax benefits recognized low income housing tax credit investments (less than) |  | $ 100
Other tax benefits | $ 100 |

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