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Variable Interest Entities (Details) (Not primary beneficiary, USD $)
Sep. 30, 2013
item
Variable interest entities  
Number of CDO structures currently in default 2
Maximum risk of loss related to VIEs, on fair value basis $ 85,700,000
Securitization SPEs
 
Variable interest entities  
Debt obligations to beneficial interest holders, unpaid principal balances $ 142,400,000,000