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Market Risk Benefits - Schedule of Net Balance of Market Risk Benefit Asset and Liabilities (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Market Risk Benefit [Roll Forward]      
Balance, beginning of period   $ 0  
Balance, end of period   2,799 $ 0
Annuities      
Market Risk Benefit [Roll Forward]      
Balance, beginning of period $ 172 0 44
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 216 1 70
Acquisition from business combination 0 2,420 0
Issuances 2 7 1
Interest accrual 2 100 3
Attributed fees collected 5 146 13
Benefits payments 0 0 0
Effect of changes in interest rates 49 (112) (117)
Effect of changes in equity markets 0 39 171
Effect of changes in equity index volatility 46 (97) (46)
Actual policyholder behavior different from expected behavior 0 0 (7)
Effect of changes in future expected policyholder behavior (4) 2 0
Effect of changes in other future expected assumptions (202) 43 (87)
Balance, end of period, before effect of changes in the instrument-specific credit 70 2,549 1
Effect of changes in the ending instrument-specific credit risk (70) 250 (1)
Balance, end of period 44 2,799 0
Less: Reinsured MRB, end of period 0 (526) 0
Balance, end of period, net of reinsurance 44 2,273 0
Net amount at risk $ 453 $ 12,051 $ 0
Weighted average attained age of contract holders (years) 64 years 71 years 65 years
Annuities | American National, Historical      
Market Risk Benefit [Roll Forward]      
Balance, beginning of period, before effect of changes in the instrument-specific credit risk     $ 114
Balance, end of period, before effect of changes in the instrument-specific credit $ 114