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Business Description and Organization (Tables)
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Ownership Interest by Limited Partners
As of December 31, 2021, the ownership structure of AB, expressed as a percentage of general and limited partnership interests, was as follows:
EQH and its subsidiaries63.0 %
AB Holding36.2 
Unaffiliated holders0.8 
100.0 %