Units Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Units Outstanding
Outstanding, Beginning of Period (in units)	273,040,452
Options exercised	526,201	700,000
Units issued	207,945
Units retired	(801,673)
Outstanding, End of Period (in units)	272,972,925
AllianceBernstein Units [Member]
Units Outstanding
Units retired	(23,100)