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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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Amount payable to other broker-dealer and clearing organization, including, but not limited to, security failed-to-receive, deposit received for security loaned, open transaction, and floor-brokerage payable.

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