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Investment Securities - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Security Owned and Pledged as Collateral, Fair Value | $ 19,600 | $ 16,500 | $ 19,600 |  | $ 19,600 |
Securities Received as Collateral | $ 1 | $ 1 | 1 |  | 1 |
Proceeds from sales |  |  | 1,100 | $ 668 | 1,735 | $ 812
Debt Securities, Available-for-sale, Realized Gain |  |  | $ 2 | $ 25 | $ 6 | $ 25
Available-for-sale securities | Government Contracts Concentration Risk | US Treasury and Agency securities |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of portfolio | 96.00% | 96.00% |  |  |  |

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