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Background and Business Description - Settlement of RMBS Litigation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) Related to Litigation Settlement |  | $ 126 | $ 0
Loss Reserves [Member] |  |  |
Gain (Loss) Related to Litigation Settlement | $ 362 |  |
Litigation Recoveries |  |  |
Gain (Loss) Related to Litigation Settlement | 126 |  |
Gain (loss) on extinguishment of debt |  |  |
Gain (Loss) Related to Litigation Settlement | (53) |  |
Gain (Loss) on Investments [Member] |  |  |
Gain (Loss) Related to Litigation Settlement | 5 |  |
R&W value |  |  |
Loss and Loss Benjefit Relating to R&W Recoveries | 123 |  |
Bank of America |  |  |
Proceeds from Legal Settlements | 1,840 |  |
Gain (Loss) Related to Litigation Settlement | 440 |  |
Nomura Credit & Capital, Inc. |  |  |
Proceeds from Legal Settlements | $ 140 |  |

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