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Investment Securities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of Investments [Line Items] |  |  |
Net unsettled investment purchases | $ 2,400 | $ 2,400 | $ 700
Investment securities, allowance for credit loss | 133 | 133 |
Provision for credit losses on investment securities | 25 | 51 |
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 | 33,100 | 33,100 |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | 33,800 | 33,800 |
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 | 21,600 | 21,600 |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | $ 21,600 | $ 21,600 |

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