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Market Risk Benefits - Schedule of Net Balance of Market Risk Benefit Asset and Liabilities (Details) - Annuity Segment - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 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 2,376
Issuances (6) 3
Interest accrual 70 21
Attributed fees collected 121 39
Effect of changes in interest rates 49 138
Effect of changes in equity markets 98 (15)
Effect of changes in equity index volatility (43) (2)
Effect of changes in future expected policyholder behavior 68 (8)
Effect of changes in other future expected assumptions 7 27
Balance, end of period, before effect of changes in the instrument-specific credit 2,913 2,580
Effect of changes in the ending instrument-specific credit risk 279 (8)
Balance, end of period 3,192 2,572
Less: Reinsured MRB, end of period (576) (618)
Balance, end of period, net of reinsurance 2,616 1,954
Net amount at risk $ 12,460 $ 12,051
Weighted average attained age of contract holders (years) 71 years 71 years