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Business Description, Organization and Basis of Presentation - Additional Information (Details) - shares
3 Months Ended 9 Months Ended
Jul. 10, 2025
Sep. 30, 2025
Sep. 30, 2025
Jul. 09, 2025
Distribution Made to Limited Partner [Line Items]        
Beneficial ownership of AB Holding units (in shares)     20,869,292  
Amended Exchange Agreement        
Distribution Made to Limited Partner [Line Items]        
Number of shares available for future exchange (in shares) 19,682,946     4,788,806
AB Holding Units | Amended Exchange Agreement | EQH        
Distribution Made to Limited Partner [Line Items]        
Beneficial ownership of AB Holding units (in shares) 19,682,946      
AB Units | Amended Exchange Agreement | EQH        
Distribution Made to Limited Partner [Line Items]        
Conversion of AB units (in shares) 19,682,946      
AB Holding | AB Corporation        
Distribution Made to Limited Partner [Line Items]        
General partnership interest (as a percent)     1.00%  
AB Holding | General Partnership Interest | AB Corporation        
Distribution Made to Limited Partner [Line Items]        
General partnership number of general partnership units owned in holding company (in shares)   100,000 100,000  
AB        
Distribution Made to Limited Partner [Line Items]        
Economic interest, percentage   68.50% 68.50%  
AB | EQH and its subsidiaries        
Distribution Made to Limited Partner [Line Items]        
General partnership interest (as a percent)   1.00%    
AB | General Partnership Interest | AB Corporation        
Distribution Made to Limited Partner [Line Items]        
General partnership interest (as a percent)     1.00%