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HELD-FOR-SALE - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2024
USD ($)
Nov. 22, 2022
Sep. 30, 2024
USD ($)
holdingCompany
Jun. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
holdingCompany
Sep. 30, 2024
USD ($)
holdingCompany
director
Dec. 31, 2023
USD ($)
holdingCompany
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Liability recorded     $ 0   $ 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 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     $ 13   $ 25    
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