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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Cash and cash equivalents | $ 147 | $ 97 | $ 108
Estimated Fair Value | 6,284 | 6,307 |
Other invested assets (includes $5 and $3, at fair value) | 912 | 829 |
Assets | 12,291 | 12,539 |
Other liabilities | 496 | 439 |
Liabilities | 6,509 | 6,774 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles |  |  |
Variable Interest Entity [Line Items] |  |  |
Due to brokers and counterparties | 15 | 0 |
Other liabilities | 3 | 4 |
Liabilities | 18 | 4 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Affiliated Entity |  |  |
Variable Interest Entity [Line Items] |  |  |
Liabilities | 3 | 3 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles |  |  |
Variable Interest Entity [Line Items] |  |  |
Other invested assets (includes $5 and $3, at fair value) | 2 | 0 |
Assets | 359 | 366 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Affiliated Entity |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets | 335 | 281 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Fund Investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Cash and cash equivalents | 23 | 35 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Equity Securities and Warrants |  |  |
Variable Interest Entity [Line Items] |  |  |
Estimated Fair Value | 97 | 83 |
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Structured products |  |  |
Variable Interest Entity [Line Items] |  |  |
Estimated Fair Value | $ 237 | $ 248 |

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