Document and Entity Information	12 Months Ended
	Dec. 31, 2012
Risk/Return:
Document Type	Other
Document Period End Date	Aug. 31, 2012
Registrant Name	ALLIANCEBERNSTEIN BLENDED STYLE SERIES INC
Central Index Key	0001172221
Amendment Flag	false
Document Creation Date	Jan. 04, 2013
Document Effective Date	Jan. 04, 2013
Prospectus Date	Dec. 31, 2012