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Investments - Additional Information (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
security
Schedule of Investments [Line Items]              
Fixed-maturity investments, non-investment grade, percent   8.80%   8.80%     12.60%
Estimated Fair Value   $ 6,278   $ 6,278     $ 6,369
Alternative investment   945   945      
Accrued investment income   $ 70   $ 70     $ 64
Number of securities with unrealized losses greater than 10% of book value for 12 months or more | security   277   277     438
Total unrealized losses for securities having losses greater than 10% of book value for 12 months or more   $ 151   $ 151     $ 223
Assets held-in-trust   82   82     79
Fixed-maturity securities, trading   136   136     147
Proceeds from sale and maturity of debt securities, available-for-sale       533 $ 575    
Securities purchased with credit deterioration   0 $ 0 0 $ 0    
Insured Financial Obligations, Loss Mitigation Securities              
Schedule of Investments [Line Items]              
Estimated Fair Value   140   140     479
Insured Financial Obligations, Loss Mitigation Securities Paid Down              
Schedule of Investments [Line Items]              
Estimated Fair Value           $ 408  
Investment resolution, amount received $ 459            
Collateralized Loan Obligation Equity Tranches              
Schedule of Investments [Line Items]              
Estimated Fair Value   242   242     277
Consolidated Investment Vehicles              
Schedule of Investments [Line Items]              
Equity method investments   45   45     33
Contingent Value Instruments              
Schedule of Investments [Line Items]              
Fixed-maturity securities, trading   125   125      
Financial Instrument, Other              
Schedule of Investments [Line Items]              
Investments, fair value disclosure   598   598      
Sound Point Capital Management, LP              
Schedule of Investments [Line Items]              
Equity method investments   414   414     418
AGL Subsidiaries              
Schedule of Investments [Line Items]              
Assets held-in-trust   789   789     $ 1,135
Future Equity Investments              
Schedule of Investments [Line Items]              
Alternative investment   945   945      
Investments, unfunded commitment   563   563      
Investments, authorized amount to invest   1,500   1,500      
Future Equity Investments | Sound Point Capital Management, LP              
Schedule of Investments [Line Items]              
Investments, authorized amount to invest   $ 1,000   $ 1,000