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NET INVESTMENT-RELATED GAINS (LOSSES) - INSURANCE - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance, as of beginning of period $ 88,133 $ 120,895
Initial impairments for credit losses recognized on securities not previously impaired 69,734 58,509
Initial credit loss allowance recognized on purchased credit deteriorated ("PCD") securities 707 8,072
Accretion of initial credit loss allowance on PCD securities 1,847 2,782
Reductions due to sales (or maturities, pay downs or prepayments) during the period of securities previously identified as credit impaired (11,925) (18,300)
Net additions / reductions for securities previously impaired (12,323) (83,825)
Balances charged off (7,841) 0
Balance, as of end of period 128,332 88,133
Corporate    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance, as of beginning of period 3,238 0
Initial impairments for credit losses recognized on securities not previously impaired 791 3,238
Initial credit loss allowance recognized on purchased credit deteriorated ("PCD") securities 0 0
Accretion of initial credit loss allowance on PCD securities 0 0
Reductions due to sales (or maturities, pay downs or prepayments) during the period of securities previously identified as credit impaired 0 0
Net additions / reductions for securities previously impaired 5,110 0
Balances charged off (7,841) 0
Balance, as of end of period 1,298 3,238
Structured    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance, as of beginning of period 84,895 120,895
Initial impairments for credit losses recognized on securities not previously impaired 68,943 55,271
Initial credit loss allowance recognized on purchased credit deteriorated ("PCD") securities 707 8,072
Accretion of initial credit loss allowance on PCD securities 1,847 2,782
Reductions due to sales (or maturities, pay downs or prepayments) during the period of securities previously identified as credit impaired (11,925) (18,300)
Net additions / reductions for securities previously impaired (17,433) (83,825)
Balances charged off 0 0
Balance, as of end of period $ 127,034 $ 84,895