Collateralized Transactions (Financial Instruments Owned That Have Been Loaned Or Pledged To Counterparties) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial instruments owned	$ 56,908	$ 51,998
U.S. Government and Agency Securities
Financial instruments owned	15,273	9,263
Other Sovereign Government Obligations
Financial instruments owned	3,278	4,047
Corporate and Other Debt
Financial instruments owned	11,980	17,024
Corporate Equities
Financial instruments owned	$ 26,377	$ 21,664

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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