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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Millions | Sep. 30, 2024 USD ($) Entity | Dec. 31, 2023 USD ($) Entity | Sep. 30, 2023 USD ($)
--- | --- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost | $ 2,069 | $ 2,197 |
Fixed maturity securities, at fair value | 2,073 |  |
Restricted Cash | 16 | 12 | $ 13
Derivative assets | 33 | 26 |
Other assets | 228 | 129 |
Total assets | 9,256 | 8,428 | 7,847
Interest Payable | 515 | 475 |
Long-term debt | 518 | 508 |
Derivative Liability | 35 | 35 |
Other Liabilities | 262 | 180 |
Liabilities | 7,383 | 6,997 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 54 | 40 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 49 | 71 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed maturity securities, at fair value | 2,238 | 2,167 |
Restricted Cash | 47 | 246 | $ 256
Financing Receivable, after Allowance for Credit Loss | 1,651 | 1,663 |
Derivative assets | 216 | 226 |
Other assets | 110 | 92 |
Total assets | 4,262 | 4,394 |
Long-term debt | 2,738 | 2,710 |
Long-term Debt, at par less amortized discount | 259 | 258 |
Long-term debt | 2,996 | 2,967 |
Derivative Liability | 1,223 | 1,197 |
Other Liabilities | 10 | 5 |
Liabilities | 4,271 | 4,404 |
Estimated Future Premium Payments Maximum Discounted Rate | 41 | 235 |
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member] |  |  |
Fixed maturity securities, at fair value | 2,146 | 2,072 |
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 85 | 88 |
Fixed maturity securities, at fair value | 92 | 95 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 7 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] |  |  |
Fixed maturity securities, at fair value | 2,146 | 2,072 |
Restricted Cash | 46 | 245 |
Financing Receivable, after Allowance for Credit Loss | 1,651 | 1,663 |
Derivative assets | 216 | 226 |
Other assets | 109 | 90 |
Total assets | 4,168 | 4,296 |
Long-term debt | 2,738 | 2,710 |
Long-term Debt, at par less amortized discount | 103 | 99 |
Long-term debt | 2,841 | 2,808 |
Derivative Liability | 1,223 | 1,197 |
Cash collateral payable | 41 |  |
Other Liabilities | 10 | 4 |
Liabilities | 4,115 | 4,244 |
Estimated Future Premium Payments Maximum Discounted Rate |  | 235 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Corporate Debt Securities [Member] |  |  |
Fixed maturity securities, at fair value | 2,146 | 2,072 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Municipal Bonds [Member] |  |  |
Fixed maturity securities, at fair value | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] |  |  |
Fixed maturity securities, at fair value | 92 | 95 |
Restricted Cash | 1 | 1 |
Financing Receivable, after Allowance for Credit Loss | 0 | 0 |
Derivative assets | 0 | 0 |
Other assets | 1 | 2 |
Total assets | 94 | 98 |
Long-term debt | 0 | 0 |
Long-term Debt, at par less amortized discount | 156 | 159 |
Long-term debt | 156 | 159 |
Derivative Liability | 0 | 0 |
Other Liabilities | 1 | 1 |
Liabilities | 156 | 160 |
Estimated Future Premium Payments Maximum Discounted Rate | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Corporate Debt Securities [Member] |  |  |
Fixed maturity securities, at fair value | 0 | 0 |
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Municipal Bonds [Member] |  |  |
Fixed maturity securities, at fair value | $ 92 | $ 95 |
Consolidated Entities [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 6 | 6 |
Consolidated Entities [Member] | Ambac UK [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 4 | 4 |
Consolidated Entities [Member] | Ambac Assurance [Member] |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 2 | 2 |

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