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ORGANIZATION (Details)
$ in Thousands, shares in Millions
 12 Months Ended
Nov. 01, 2022
USD ($)
shares
Oct. 03, 2022
USD ($)
Jul. 01, 2022
USD ($)
shares
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 01, 2021
USD ($)
Organization Basis Of Presentation [Line Items]              
Number of reportable segments | segment       6      
Deferred variable annuity   $ 360          
Assets       $ 276,814,000 $ 252,702,000    
AB units fair value           $ 293,000  
Massachusetts Domiciled Insurance Company              
Organization Basis Of Presentation [Line Items]              
Guaranteed credit rate percentage   3.00%          
Guaranteed credit amount of general account assets   $ 4,000,000          
Reinsurance, guaranteed credit amount of separate account assets   5,000,000          
Reinsurance Transaction | Number of Employees, Total              
Organization Basis Of Presentation [Line Items]              
Deferred variable annuity   $ 360          
Reinsurance Transaction | Number of Employees, Total | Massachusetts Domiciled Insurance Company              
Organization Basis Of Presentation [Line Items]              
Concentration risk, percentage   50.00%          
Alliance Bernstein              
Organization Basis Of Presentation [Line Items]              
Economic interest       61.00% 61.00%    
AB units issued (in shares) | shares 12.1   3.2        
AB units fair value $ 456,000   $ 133,000        
AB Contingent consideration payable     $ 229,000        
Performance obligation period     6 years        
Alliance Bernstein | CarVal Investments L.P.              
Organization Basis Of Presentation [Line Items]              
Ownership percentage acquired     100.00%        
Alliance Bernstein | Corporate Solutions Life Reinsurance Company              
Organization Basis Of Presentation [Line Items]              
Assets   $ 2,800,000          
Direct insurance liabilities ceded   $ 4,100,000          
Alliance Bernstein | Corporate Solutions Life Reinsurance Company | GMxB derivative features’ liability              
Organization Basis Of Presentation [Line Items]              
Guarantees             $ 1,200,000
Separate account, liability, ceded             $ 5,300,000