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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - New Recovery Bonds (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 6,488	$ 7,119
Fixed-maturity securities, trading	340	303
Amortized Cost	7,044	7,707
Gross Unrealized Gains	51	65
Gross unrealized loss	(528)	(588)
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Puerto Rico Trusts
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	218	204
Fixed-maturity securities, trading	5	5
Amortized Cost	205	204
Gross Unrealized Gains	15	4
Gross unrealized loss	$ (2)	$ (4)

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