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Consolidations and Transfers of Financial Assets Qualifying Sales of Portfolio Securitizations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Transfers and Servicing [Abstract]
Proceeds from the initial sale of securities from portfolio securitizations	$ 183	$ 143	$ 479	$ 764
Proceeds from portfolio securitizations accounted for as secured borrowings			421	0
Fair value of trading securities underlying the portfolio securitizations accounted for as secured borrowings	189		189
Unpaid principal balance of mortgage loans of consolidated trusts underlying the portfolio securitizations accounted for as secured borrowings	$ 214		$ 214

Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

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