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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Millions | Mar. 31, 2024 USD ($) Entity | Dec. 31, 2023 USD ($) Entity | Mar. 31, 2023 USD ($)
--- | --- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost | $ 2,135 | $ 2,197 |
Fixed maturity securities, at fair value | 2,095 |  |
Restricted Cash | 11 | 12 | $ 10
Derivative assets | 21 | 26 |
Other assets | 129 | 129 |
Total assets | 8,429 | 8,428 | 8,219
Interest Payable | 487 | 475 |
Long-term debt | 512 | 508 |
Derivative Liability | 29 | 35 |
Other Liabilities | 259 | 199 |
Liabilities | 6,993 | 6,997 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 37 | 40 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 75 | 71 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed maturity securities, at fair value | 2,162 | 2,167 |
Restricted Cash | 252 | 246 | $ 256
Financing Receivable, after Allowance for Credit Loss | 1,604 | 1,663 |
Derivative assets | 221 | 226 |
Other assets | 92 | 92 |
Total assets | 4,330 | 4,394 |
Long-term debt | 2,671 | 2,710 |
Long-term Debt, at par less amortized discount | 254 | 258 |
Long-term debt | 2,925 | 2,967 |
Derivative Liability | 1,170 | 1,197 |
Other Liabilities | 6 | 5 |
Liabilities | 4,340 | 4,404 |
Estimated Future Premium Payments Maximum Discounted Rate | 239 | 235 |
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member] |  |  |
Fixed maturity securities, at fair value | 2,070 | 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 | 7 | 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 | 2,070 | 2,072 |
Restricted Cash | 251 | 245 |
Financing Receivable, after Allowance for Credit Loss | 1,604 | 1,663 |
Derivative assets | 221 | 226 |
Other assets | 91 | 90 |
Total assets | 4,236 | 4,296 |
Long-term debt | 2,671 | 2,710 |
Long-term Debt, at par less amortized discount | 98 | 99 |
Long-term debt | 2,769 | 2,808 |
Derivative Liability | 1,170 | 1,197 |
Cash collateral payable | 239 |  |
Other Liabilities | 6 | 4 |
Liabilities | 4,184 | 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 | 2,070 | 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 | 155 | 159 |
Long-term debt | 155 | 159 |
Derivative Liability | 0 | 0 |
Other Liabilities | 0 | 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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