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MARKET RISK BENEFITS - Schedule of Net Balance of Market Risk Benefit Asset and Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Market Risk Benefit [Roll Forward]      
Balance, beginning of period $ 2,799 $ 55  
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 2,549 39  
Acquisition from business combination 0 2,376  
Derecognition 0 (129)  
Issuance (6) 3  
Interest accrual 70 24  
Attributed fees collected 121 52  
Benefits payments 0 0  
Effect of changes in interest rates 51 138  
Effect of changes in equity markets 98 (24)  
Effect of changes in equity index volatility (43) (24)  
Effect of changes in future expected policyholder behavior 68 (8)  
Effect of changes in other future expected assumptions 7 67  
Balance, end of period, before the effect of changes in the instrument-specific credit risk 2,915 2,514  
Effect of changes in the ending instrument-specific credit risk 278 58  
Balance, end of period 3,193 2,572 $ 2,799
Less: Reinsured MRB, end of period (576) (618)  
Balance, end of period, net of reinsurance 2,617 1,954  
Net amount at risk $ 12,460 $ 12,051  
Weighted-average attained age of contract holders (years) 71 years 71 years