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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) policy entity | Dec. 31, 2023 USD ($) entity policy | Dec. 31, 2022 USD ($) entity | Jul. 01, 2024 USD ($) | Dec. 31, 2021 entity
Variable Interest Entity [Line Items] |  |  |  |  |
Deconsolidation of investment vehicles |  | $ (132) |  |  |
Fixed-maturity securities, available-for-sale | $ 6,369 | 6,307 |  |  |
VIE, other consolidated, carrying amount, assets |  | 92 |  |  |
VIE, other consolidated, carrying amount, liabilities |  | $ 7 |  |  |
VIE, number of policies monitored | policy | 15,000 |  |  |  |
VIE, number of policies monitored, not within the scope of ASC 810 | policy | 14,000 |  |  |  |
VIE, number of policies that contain provisions for consolidation | policy | 50 | 68 |  |  |
Maximum loss exposure | $ 761 |  |  |  |
CLOs |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Fixed-maturity securities, available-for-sale | 611 | $ 450 |  |  |
Nonredeemable Noncontrolling Interests |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Deconsolidation of investment vehicles |  | (132) |  |  |
Sound Point Agreement |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets |  | 4,700 |  |  |
Liabilities |  | 4,400 |  |  |
Gain (loss) on disposal of discontinued operation, net of tax |  | 16 |  |  |
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Gain (loss) in the instrument specific credit risk of the VIEs' assets | $ (5) | $ 3 | $ 10 |  |
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
December 31 | entity |  | 24 |  |  |
Consolidated investment vehicles | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
December 31 | entity | 2 | 3 | 22 |  | 20
Number of entities that distributed assets | entity | 2 |  |  |  |
Variable interest entity, distributed investments |  |  |  | $ 293 |
Consolidated investment vehicles | Variable Interest Entity, Primary Beneficiary | CLOs |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Fixed-maturity securities, available-for-sale | $ 263 |  |  |  |
Consolidated investment vehicles | Foreign Exchange Forward | Variable Interest Entity, Primary Beneficiary | Arithmetic Average |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Derivative, notional amount | $ 0 | $ 41 |  |  |
Consolidated investment vehicles | Assured IM | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Gain consolidation |  |  | $ 417 |  |

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