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Business Description, Organization and Basis of Presentation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]    
Limited partners or members ownership interest in Company (in hundredths) 100.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest  
Threshold Amount for Including Institutions in Private Clients $ 25ab_ThresholdAmountForIncludingInstitutionsInPrivateClients  
AXA and its subsidiaries ownership interest in Holding company (in hundredths) 1.40%ab_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersOwnershipInterestInHoldingCompany  
General Partner: units outstanding (in shares) 100,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding 100,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
General partnership interest (in hundredths) 1.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest  
AXA and its subsidiaries economic interest in Company (in hundredths) 62.70%ab_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersEconomicInterestInCompany  
AXA and Its Subsidiaries [Member]    
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]    
Limited partners or members ownership interest in Company (in hundredths) 62.20%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= ab_AxaAndItsSubsidiariesMember
 
AB Holding [Member]    
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]    
Limited partners or members ownership interest in Company (in hundredths) 36.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= ab_HoldingsMember
 
Unaffiliated Holders [Member]    
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]    
Limited partners or members ownership interest in Company (in hundredths) 1.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= ab_UnaffiliatedHoldersMember