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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Schedule of Assets and Liabilities of Consolidated Investment Vehicles (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Cash $ 107 $ 97 $ 120
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss 7,119 6,307  
Other invested assets (includes $3 and $30, at fair value) 133 829  
Assets of consolidated investment vehicles (includes $331 and $5,363, at fair value) 5,493 366  
Short-term investments, at fair value 810 1,661  
Total assets 16,843 12,539  
Liabilities of consolidated investment vehicles (includes $0 and $4,431, at fair value) 4,625 4  
Financial guaranty variable interest entities’ liabilities, at fair value (with recourse $543 and $702, without recourse $11 and $13) 715 554  
Other liabilities 457 435  
Total liabilities 11,551 6,774  
Corporate securities      
Variable Interest Entity [Line Items]      
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss 2,084 2,141  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles      
Variable Interest Entity [Line Items]      
Liabilities of consolidated investment vehicles (includes $0 and $4,431, at fair value) 4,090 0  
Financial guaranty variable interest entities’ liabilities, at fair value (with recourse $543 and $702, without recourse $11 and $13) 313 0  
Due to brokers and counterparties 112 0  
Other liabilities 110 4  
Total liabilities 4,625 4  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Affiliated Entity      
Variable Interest Entity [Line Items]      
Total liabilities   3  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles      
Variable Interest Entity [Line Items]      
Cash 38 0  
Other invested assets (includes $3 and $30, at fair value) 1 0  
Due from brokers and counterparties 32 0  
Total assets 5,493 366  
Redeemable noncontrolling interest 21    
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Investments in AssuredIM Funds and Other Affiliated Entities      
Variable Interest Entity [Line Items]      
Total assets $ 392    
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Investments in Other Affiliated Entities      
Variable Interest Entity [Line Items]      
Total assets   281  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | CLO obligations, FVO      
Variable Interest Entity [Line Items]      
CLOs, weighted average maturity 6 years 2 months 12 days    
CLOs, weighted average interest rate 5.30%    
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Warehouse financing debt      
Variable Interest Entity [Line Items]      
CLOs, weighted average maturity 1 year 10 months 24 days    
CLOs, weighted average interest rate 4.50%    
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Fund Investments      
Variable Interest Entity [Line Items]      
Cash $ 59 35  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Equity securities and warrants      
Variable Interest Entity [Line Items]      
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss 434 83  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Structured products      
Variable Interest Entity [Line Items]      
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss 128 248  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Corporate securities      
Variable Interest Entity [Line Items]      
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss 96 0  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Loans in CLOs and CLO warehouses, FVO      
Variable Interest Entity [Line Items]      
Assets of consolidated investment vehicles (includes $331 and $5,363, at fair value) 4,570 0  
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Short-term investments      
Variable Interest Entity [Line Items]      
Short-term investments, at fair value 135 $ 0  
Voting Interest Entity | Consolidated Investment Vehicles      
Variable Interest Entity [Line Items]      
Total assets 58    
Total liabilities $ 1