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Business Description and Organization - Additional Information (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Ownership structure of AB expressed as percentage of general and limited partnership interests    
General partnership units (in units) 100,000 100,000
AB Holding | EQH    
Ownership structure of AB expressed as percentage of general and limited partnership interests    
General partnership interest (percent) 4.00%  
AB Holding | AllianceBernstein Corporation    
Ownership structure of AB expressed as percentage of general and limited partnership interests    
General partnership interest (percent) 1.00%  
General partnership units (in units) 100,000  
AllianceBernstein L.P. | EQH and its subsidiaries    
Ownership structure of AB expressed as percentage of general and limited partnership interests    
General partnership interest (percent) 64.50%