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Units Outstanding
 3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Units Outstanding Units Outstanding
Changes in AB Units outstanding during the three-month period ended March 31, 2022 were as follows:
 
Outstanding as of December 31, 2021271,453,043 
Units issued582,992 
Units retired(260,245)
Outstanding as of March 31, 2022271,775,790