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Business Description And Organization (Details) (USD $)
1 Months Ended3 Months Ended9 Months Ended12 Months Ended
Apr. 30, 2010
Dec. 31, 2009
Sep. 30, 2011
Dec. 31, 2009
Dec. 31, 2010
Schedule of Limited Partnership Ownership Interest By Partners [Line Items]     
Limited Partners or Members Ownership Interest in Company (in hundredths)  100.00%  
U.S. Treasury Department selected pre-qualified fund manager under the Public-Private Investment Program   9 
Public-Private Investment Fund firms closing an initial amount of at least $500 million 5   
Total initial funds raised by top five Public-Private Investment Fund firms, minimum amount $ 500,000,000   
Funds raised for Public-Private Investment Fund$ 1,100,000,000    
AXA and its Subsidiaries Ownership Interest in Holding company (in hundredths)  1.40%  
General partnership units owned in Holding company (in units)  100,000 100,000
General partnership interest (in hundredths)  1.00%  
AXA and its Subsidiaries economic interest in Company (in hundredths)  63.10%  
AXA And Its Subsidiaries [Member]
     
Schedule of Limited Partnership Ownership Interest By Partners [Line Items]     
Limited Partners or Members Ownership Interest in Company (in hundredths)  60.90%  
Holdings [Member]
     
Schedule of Limited Partnership Ownership Interest By Partners [Line Items]     
Limited Partners or Members Ownership Interest in Company (in hundredths)  37.50%  
Unaffiliated Holders [Member]
     
Schedule of Limited Partnership Ownership Interest By Partners [Line Items]     
Limited Partners or Members Ownership Interest in Company (in hundredths)  1.60%