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Collateralized Transactions (Financial Instruments Owned That Have Been Loaned Or Pledged To Counterparties) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Financial instruments owned $ 51,572 $ 54,506
U.S. Government And Agency Securities [Member]
   
Financial instruments owned 7,222 11,513
Other Sovereign Government Obligations [Member]
   
Financial instruments owned 6,547 8,741
Corporate And Other Debt [Member]
   
Financial instruments owned 14,257 12,333
Corporate Equities [Member]
   
Financial instruments owned $ 23,546 $ 21,919