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Collateralized Transactions (Cash And Securities Deposited With Clearing Organizations Or Segregated Under Federal And Other Regulations Or Requirements) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Collateralized Transactions    
Cash Reserve Deposit Required and Made $ 29,418 $ 29,454
Securities 11,584 [1] 15,120 [1]
Total $ 41,002 $ 44,574
[1] Securities deposited with clearing organizations or segregated under federal and other regulations or requirements are sourced from Federal funds sold and securities purchased under agreements to resell and Financial instruments owned in the condensed consolidated statements of financial condition.