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Market Risk Benefits - Schedule of Net Balance of Market Risk Benefit Asset and Liabilities (Details) - Annuities - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Market Risk Benefit [Roll Forward]    
Balance, beginning of period $ 2,799 $ 0
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 2,549 1
Acquisition from business combination 0 2,420
Issuances (4) 3
Interest accrual 110 61
Attributed fees collected 191 91
Effect of changes in interest rates 73 413
Effect of changes in equity markets 104 (39)
Effect of changes in equity index volatility (53) (95)
Effect of changes in future expected policyholder behavior 62 (13)
Effect of changes in other future expected assumptions 210 44
Balance, end of period, before effect of changes in the instrument-specific credit 3,242 2,886
Effect of changes in the ending instrument-specific credit risk 153 81
Balance, end of period 3,395 2,967
Less: Reinsured MRB, end of period (595) (746)
Balance, end of period, net of reinsurance 2,800 2,221
Net amount at risk $ 12,717 $ 12,078
Weighted average attained age of contract holders (years) 71 years 71 years