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LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Schedule of Liability for Future Policy Benefits, Weighted Average Interest Rates (Details)
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Interest accretion rate 4.50%   4.50%
Term      
Liability for Future Policy Benefit, Activity [Line Items]      
Interest accretion rate 5.60% 5.70%  
Current discount rate 5.60% 5.10%  
Payout - Legacy      
Liability for Future Policy Benefit, Activity [Line Items]      
Interest accretion rate 3.90% 3.40%  
Current discount rate 5.70% 5.00%  
Individual Retirement - Payout      
Liability for Future Policy Benefit, Activity [Line Items]      
Interest accretion rate 5.80% 5.20%  
Current discount rate 5.00% 4.90%  
Group Pension      
Liability for Future Policy Benefit, Activity [Line Items]      
Interest accretion rate 3.30% 3.40%  
Current discount rate 5.70% 5.10%  
Health      
Liability for Future Policy Benefit, Activity [Line Items]      
Interest accretion rate 5.80% 5.20%  
Current discount rate 3.40% 3.30%