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Business Description and Organization (Tables)
 12 Months Ended
Dec. 31, 2011
Business Description and Organization [Abstract]  
Ownership Interest by Limited Partners
As of December 31, 2011, the ownership structure of AllianceBernstein, expressed as a percentage of general and limited partnership interests, was as follows:

AXA and its subsidiaries
  60.9 %
Holding
  37.5 
Unaffiliated holders
  1.6 
    100.0 %