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Investment Securities (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Net unsettled investment sales | $ 30 |  |
Net unsettled investment purchases |  |  | $ 800
Investment securities, allowance for credit loss | 148 | $ 149 |
Pretax loss included in AOCI from derivatives | (305) |  | $ (22)
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 | 39,200 |  |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | 36,600 |  |
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 | 33,000 |  |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | $ 31,000 |  |

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