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Units Outstanding (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Changes in Units Outstanding
Changes in AB Units outstanding for the years ended December 31, 2017 and 2016 were as follows:
 
2017
 
2016
Outstanding as of January 1,
268,893,534

 
272,301,827

Options exercised
1,179,860

 
358,262

Units issued
5,546,695

 
4,455,944

Units retired(1)
(6,960,756
)
 
(8,222,499
)
Outstanding as of December 31,
268,659,333

 
268,893,534