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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Policy Liabilities (Details)
9 Months Ended
Sep. 30, 2021
scenario
Policyholder Account Balance [Line Items]  
Benefit rider payout period 6 years
Number of risk neutral scenarios 1,000
Minimum  
Policyholder Account Balance [Line Items]  
Rider benefit calculation, account value multiplier 1
Maximum  
Policyholder Account Balance [Line Items]  
Rider benefit calculation, account value multiplier 2