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Market Risk Benefits - Schedule of Net Balance of Market Risk Benefit Asset and Liabilities (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Market Risk Benefit [Roll Forward]    
Balance, beginning of period $ 0  
Balance, end of period 2,967 $ 0
Annuity    
Market Risk Benefit [Roll Forward]    
Balance, beginning of period 0 44
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 1 70
Acquisition from business combination 2,420 0
Issuances 3 1
Interest accrual 61 3
Attributed fees collected 91 13
Benefits payments 0 0
Effect of changes in interest rates 413 (117)
Effect of changes in equity markets (39) 171
Effect of changes in equity index volatility (95) (46)
Actual policyholder behavior different from expected behavior 0 (7)
Effect of changes in future expected policyholder behavior (13) 0
Effect of changes in other future expected assumptions 44 (87)
Balance, end of period, before effect of changes in the instrument-specific credit 2,886 1
Effect of changes in the ending instrument-specific credit risk 81 (1)
Balance, end of period 2,967 0
Less: Reinsured MRB, end of period (746) 0
Balance, end of period, net of reinsurance 2,221 0
Net amount at risk $ 12,078 $ 0
Weighted average attained age of contract holders (years) 71 years 65 years