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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
	Mar. 31, 2013	Mar. 31, 2012
Transfers and Servicing [Abstract]
Proceeds from the initial sale of securities from portfolio securitizations	$ 176	$ 133
Proceeds from portfolio securitizations accounted for as secured borrowings		421
Fair value of trading securities underlying the portfolio securitizations accounted for as secured borrowings	166
Unpaid principal balance of mortgage loans of consolidated trusts underlying the portfolio securitizations accounted for as secured borrowings	$ 189

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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