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Business Description, Organization and Basis of Presentation - Narrative (Details) - shares
9 Months Ended
Jul. 10, 2025
Sep. 30, 2025
Jul. 09, 2025
Dec. 31, 2024
Ownership structure of AB Holding        
Units outstanding (in shares)   100,000   100,000
Beneficial ownership of AB Holding units (in shares)   20,833,912    
Master Exchange Agreement        
Ownership structure of AB Holding        
Remaining authorized shares (in shares) 19,682,946   4,788,806  
AB Holding Units | Amended Exchange Agreement | EQH        
Ownership structure of AB Holding        
Beneficial ownership of AB Holding units (in shares) 19,682,946      
AB Units | Amended Exchange Agreement | EQH        
Ownership structure of AB Holding        
Conversion of AB units (in shares) 19,682,946      
AB Holding | AllianceBernstein Corporation | General Partnership Interest        
Ownership structure of AB Holding        
Units outstanding (in shares)   100,000    
AB        
Ownership structure of AB Holding        
Economic interest, percentage   68.50%    
AB | AllianceBernstein Corporation | General Partnership Interest        
Ownership structure of AB Holding        
General partnership interest (as a percent)   1.00%