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Background and Business Description - Redemption of Notes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net realized gains on extinguishment of debt | $ 0 | $ 81 | $ 33
5.1% Surplus Notes, General Account, Due 2020 [Member] |  |  |
Net realized gains on extinguishment of debt |  | $ 134 |
Nomura Credit & Capital, Inc. |  |  |
Proceeds from Legal Settlements | 140 |  |
Sitka AAC Note | Ambac Assurance Corporation [Member] |  |  |
Repayments of Long-term Debt | $ 1,218 |  |
Long-term Debt, Repayment, Premium Paid on Principal | 103.00% |  |
Net realized gains on extinguishment of debt | $ 53 |  |
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member] |  |  |
Repayments of Long-term Debt | $ 213 |  |

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