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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Narrative (Details)
$ in Millions
 12 Months Ended
Jul. 01, 2023
consolidatedInvestmentVehicle
Dec. 31, 2023
USD ($)
consolidatedInvestmentVehicle
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Entity
Dec. 31, 2023
USD ($)
Dec. 31, 2023
consolidatedInvestmentVehicle
Dec. 31, 2023
Security
Dec. 31, 2023
entity
Dec. 31, 2023
consolidatedCLO
Dec. 31, 2023
Entity
Dec. 31, 2023
policy
Aug. 31, 2023
USD ($)
Dec. 31, 2022
consolidatedInvestmentVehicle
Dec. 31, 2022
Security
Dec. 31, 2022
entity
Dec. 31, 2022
consolidatedCLO
Dec. 31, 2022
Entity
Dec. 31, 2022
policy
Variable Interest Entity [Line Items]                                    
Amortized Cost     $ 7,707   $ 6,746                          
Net Par Outstanding     233,258   249,153             $ 108            
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss     7,119   6,307                          
Less than 12 months (in securities) | Security             274             1,340        
Gross unrealized losses     588   417                          
Fair Value     3,751   766                          
Deconsolidation of investment vehicles   $ (132)                                
VIE, other consolidated, carrying amount, assets     86   92                          
VIE, other consolidated, carrying amount, liabilities     12   7                          
VIE, number of policies monitored | policy                     15,000              
VIE, number of policies monitored, not within the scope of ASC 810 | policy                     14,000              
VIE, number of policies that contain provisions for consolidation | policy                     68             85
Maximum loss exposure         326                          
Carrying value of investments not consolidated         314                          
Other assets not consolidated         12                          
Nonredeemable Noncontrolling Interests                                    
Variable Interest Entity [Line Items]                                    
Deconsolidation of investment vehicles   (132)                                
Sound Point Agreement                                    
Variable Interest Entity [Line Items]                                    
Assets         4,700                          
Liabilities         4,400                          
Gain (loss) on disposal of discontinued operation, net of tax   16                                
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary                                    
Variable Interest Entity [Line Items]                                    
Change in the instrument specific credit risk of the VIEs' assets   $ 3 10 $ 14                            
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts                                    
Variable Interest Entity [Line Items]                                    
Total number of entities consolidated | entity               24             45      
Amortized Cost     204                              
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss     204                 $ 73            
Less than 12 months (in securities) | Security                           14        
Gross unrealized losses     4                              
Fair Value     110                              
Securities in excess of carrying value | Security                           8        
Value securities in excess of carrying value     3                              
Puerto Rico Trusts | Variable Interest Entity, Primary Beneficiary                                    
Variable Interest Entity [Line Items]                                    
Custody receipts, notice period   30 days                                
Consolidated Investment Vehicles                                    
Variable Interest Entity [Line Items]                                    
Number of remaining entities | consolidatedInvestmentVehicle 3 3                                
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary                                    
Variable Interest Entity [Line Items]                                    
Total number of entities consolidated       20   3       3     22       22  
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary | CLO contracts                                    
Variable Interest Entity [Line Items]                                    
Total number of entities consolidated | consolidatedCLO                 0             10    
Deconsolidation, net assets     417                              
Consolidated Investment Vehicles | Foreign Exchange Forward | Variable Interest Entity, Primary Beneficiary                                    
Variable Interest Entity [Line Items]                                    
Derivative, notional amount     46   36                          
Consolidated Investment Vehicles | Foreign Exchange Forward | Variable Interest Entity, Primary Beneficiary | Arithmetic Average                                    
Variable Interest Entity [Line Items]                                    
Derivative, notional amount     $ 47   $ 41                          
Consolidated Investment Vehicles | Assured IM | Variable Interest Entity, Primary Beneficiary                                    
Variable Interest Entity [Line Items]                                    
Gain consolidation       $ 31