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HELD-FOR-SALE - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2024
USD ($)
Nov. 22, 2022
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
holdingCompany
Dec. 31, 2024
USD ($)
director
holdingCompany
Dec. 31, 2023
USD ($)
holdingCompany
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]     Other income      
Liability recorded       $ 0 $ 0 $ 153
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Corporate Solutions Life Reinsurance Company            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Liability recorded           $ 153
NA JV            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of directors included on the Board of Directors | director         2  
AB Holding And Societe Generale | JVs            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of joint venture | holdingCompany       2 2 2
AB Holding And Societe Generale | Outside NA JV            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of joint venture | holdingCompany           1
AB Holding And Societe Generale | NA JV            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of joint venture | holdingCompany           1
AB Holding | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Alliance Bernstein Research Services Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Recognized revenues       $ 36    
Net carrying amount of assets and liabilities included in sale $ 312          
Pre-tax gain on divestiture     $ 135      
Liability recorded 103          
AB Holding | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Corporate Solutions Life Reinsurance Company            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Non cash valuation adjustment           $ 7
AB Holding | JVs            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Investment in consolidated subsidiaries $ 284          
AB Holding | JVs            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Interest in joint venture   49.00%        
Period for option to sell ownership interest in joint venture 5 years          
AB Holding | NA JV            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Interest in joint venture 66.70%          
Number of directors included on the Board of Directors | director         4  
Societe Generale | JVs            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash payment to equalize value of investment $ 304          
Prepaid consideration $ 103          
Societe Generale | JVs            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Interest in joint venture   51.00%        
Expected interest in joint venture 100.00% 100.00%        
Period to reach expected interest in joint venture 5 years 5 years        
Exercise period to increase ownership interest in joint venture 5 years          
Societe Generale | Outside NA JV            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Interest in joint venture 51.00%          
Societe Generale | NA JV            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Interest in joint venture 51.00%          
Number of directors included on the Board of Directors | director         3