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Variable Interest Entities (Unconsolidated Collateralized Debt Or Loan Obligations And Other Sponsored Investment Funds) (Detail) (USD $)
In Billions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]    
Assets at fair value $ 5 $ 5
Liabilities 7 [1] 7 [1]
Net assets $ (2) $ (2)
[1] Amounts primarily comprised of unpaid principal debt obligations to CDO/CLO debt holders.