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INVESTMENTS - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-Sale [Line Items]      
Reclassification of specific investments from fixed maturity securities, available for sale at fair value to fixed maturity securities, held to maturity at amortized cost net of credit allowances $ 0 $ 722 $ 0
Unrealized loss from transfer 42    
Aggregate market value of investments in unrealized loss position 14,789 19,647  
Gross unrealized losses on investments in unrealized loss position 1,137 1,982  
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 102 1,217  
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 1,035 764  
Additional contractual commitments 2,800    
Other invested assets $ 1,300 $ 939  
Number of securities held as primary beneficiary | security 0 0  
Securities, carrying value $ 1,400    
Variable Interest Entity, Not Primary Beneficiary      
Debt Securities, Available-for-Sale [Line Items]      
Maximum exposure to loss 4,800 $ 4,100  
Commitments to fund investments $ 2,100    
Investments, Debt Securities Benchmark | Issuer Concentration Risk | Issuer One      
Debt Securities, Available-for-Sale [Line Items]      
Percentage threshold of unrealized losses not exceeded by any one single issuer 3.00% 5.20%  
Investments, Debt Securities Benchmark | Issuer Concentration Risk | Issuer Two      
Debt Securities, Available-for-Sale [Line Items]      
Percentage threshold of unrealized losses not exceeded by any one single issuer 0.70% 0.20%  
Fixed maturity securities      
Debt Securities, Available-for-Sale [Line Items]      
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation   $ 1,200  
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation $ 1,000 764  
Investment Grade      
Debt Securities, Available-for-Sale [Line Items]      
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 86 1,100  
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation $ 1,000 $ 732