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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Additional Information (Details) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) policy consolidatedInvestmentVehicle entity Entity | Jul. 01, 2024 USD ($) | Dec. 31, 2023 USD ($) consolidatedInvestmentVehicle entity Entity policy
Variable Interest Entity [Line Items] |  |  |  |
Number of policies monitored | policy |  | 15,000 |  |
Number of policies monitored, not within the scope of ASC 810 | policy |  | 14,000 |  |
Number of policies that contain provisions for consolidation | policy |  | 59 |  | 68
Net fair value gains and losses on FG VIEs are expected to reverse to zero at maturity of the VIE debt |  | $ 485,000,000 |  |
Sound Point Agreement |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Assets held for sale | $ 4,700,000,000 |  |  |
Deconsolidated liabilities | 4,400,000,000 |  |  |
Loss on deconsolidation | $ 16,000,000 |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Other consolidated VIE assets |  |  |  | $ 92,000,000
Other consolidated VIE liabilities |  |  |  | $ 7,000,000
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Maximum loss exposure |  | $ 0 |  |
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total number of entities consolidated | entity |  | 24 |  | 24
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Structured Finance and Other |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total number of entities consolidated | Entity |  | 23 |  | 24
Puerto Rico Trusts | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Custody receipts, notice period |  | 30 days |  |
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total number of entities consolidated | consolidatedInvestmentVehicle |  | 3 |  | 3
Distributed investments |  |  | $ 28,000,000 |
Consolidated Investment Vehicles | Average | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Collateral posting requirement |  | $ 41,000,000 |  | $ 41,000,000

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