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Investment Securities (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |
Investment securities, allowance for credit loss | $ 82 |  |  |
Provision for credit losses on investment securities | 80 |  |  |
Securities available for sale debt securities, amortized cost | 84,172 |  |  | $ 67,790
Investment securities – available for sale | 87,358 |  |  | 69,163
Investment securities – held to maturity | 1,441 |  |  | 17,661
Held-to-maturity securities, fair value | 1,605 |  |  | 18,044
Net unsettled investment purchases | 200 |  |  | 500
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Securities available for sale debt securities, amortized cost |  | $ 49 | $ 16,200 | 16,200
Investment securities – available for sale |  | 48 | $ 16,500 | 16,500
Investment securities – held to maturity |  | (49) |  | (16,200)
Held-to-maturity securities, fair value |  | $ (48) |  | $ (16,500)
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost of debt securities of a single issuer that exceeds 10 percent of shareholders equity | 32,900 |  |  |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | 34,200 |  |  |
Federal Home Loan Mortgage Corp (FHLMC) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost of debt securities of a single issuer that exceeds 10 percent of shareholders equity | 14,700 |  |  |
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity | $ 14,900 |  |  |

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