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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Additional Information (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
Entity
entity
consolidatedInvestmentVehicle
policy
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Entity
policy
consolidatedInvestmentVehicle
Variable Interest Entity [Line Items]      
Liabilities $ 11,829,000,000   $ 11,708,000,000
Estimated Fair Value 8,156,000,000   8,202,000,000
Fixed-maturity securities, trading 174,000,000   0
Net fair value gains and losses on FG VIEs are expected to reverse to zero at maturity of the VIE debt 1,000,000   1,000,000
Fair value gains (losses) on credit derivatives (3,000,000) $ (19,000,000)  
Other consolidated VIE assets 92,000,000   96,000,000
Other consolidated VIE liabilities $ 12,000,000   $ 11,000,000
Number of policies monitored | policy 16,000    
Number of policies monitored, not within the scope of ASC 810 | policy 14,000    
Number of policies that contain provisions for consolidation | policy 63   69
Joint Healthcare Fund | Line of Credit      
Variable Interest Entity [Line Items]      
Maximum borrowing capacity $ 80,000,000    
Long-term line of credit 15,000,000    
Consolidated Healthcare Fund | Line of Credit      
Variable Interest Entity [Line Items]      
Maximum borrowing capacity $ 48,000,000    
Prime Rate | Joint Healthcare Fund | Line of Credit      
Variable Interest Entity [Line Items]      
Base interest rate floor 3.00%    
EURIBOR | Joint Healthcare Fund | Line of Credit      
Variable Interest Entity [Line Items]      
Base interest rate floor 0.00%    
London Interbank Offered Rate (LIBOR) | Joint Healthcare Fund | Line of Credit      
Variable Interest Entity [Line Items]      
Base interest rate floor 0.00%    
Financial Guaranty Variable Interest Entities      
Variable Interest Entity [Line Items]      
Maximum loss exposure $ 0    
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Total number of entities consolidated | Entity 26   25
Change in the instrument specific credit risk of the VIEs' assets $ (5,000,000) (3,000,000)  
Financial Guaranty Variable Interest Entities | Puerto Rico | Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Estimated Fair Value 45,000,000    
Amortized Cost 48,000,000    
Fixed-maturity securities, trading 8,000,000    
Initial consolidation, gain (loss) $ 4,000,000    
Puerto Rico Trusts [Line Items] | Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Total number of entities consolidated | entity 9    
Custody receipts, notice period 30 days    
Consolidated Investment Vehicles      
Variable Interest Entity [Line Items]      
Number of entities consolidated that meets VOE criteria | consolidatedInvestmentVehicle 1   1
Collateral posting requirement $ 68,000,000   $ 49,000,000
Fair value gains (losses) on credit derivatives 4,000,000 $ 2,000,000  
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary | Line of Credit      
Variable Interest Entity [Line Items]      
Maximum borrowing capacity 1,000,000,000    
Remaining borrowing capacity 591,000,000    
Long-term line of credit $ 310,000,000    
Consolidated Investment Vehicles | EURIBOR | Variable Interest Entity, Primary Beneficiary | Line of Credit      
Variable Interest Entity [Line Items]      
Basis spread on variable rate 1.00%    
Consolidated Investment Vehicles | London Interbank Offered Rate (LIBOR) | Variable Interest Entity, Primary Beneficiary | Line of Credit      
Variable Interest Entity [Line Items]      
Basis spread on variable rate 1.00%    
Consolidated Investment Vehicles | Maximum | Future Equity Investments      
Variable Interest Entity [Line Items]      
Committed capital $ 345,000,000    
Consolidated Investment Vehicles | Average      
Variable Interest Entity [Line Items]      
Collateral posting requirement $ 59,000,000   $ 34,000,000