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Investment Securities (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Net unsettled investment purchases | $ 952 |  | $ 28
Investment securities, allowance for credit loss | 93 | $ 92 |
Pretax loss included in AOCI from derivatives | 280 |  | $ 297
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |
Schedule of Investments [Line Items] |  |  |
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity | 35,900 |  |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | 34,000 |  |
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans |  |  |
Schedule of Investments [Line Items] |  |  |
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity | 32,400 |  |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | $ 31,000 |  |

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