Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments (Details 2) (USD $) In Millions					12 Months Ended
Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Dec. 31, 2010 Repurchase Liability [Member]	Dec. 31, 2009 Repurchase Liability [Member]	Dec. 31, 2008 Repurchase Liability [Member]
Summary of changes in repurchase liability
Allowance for lending-related commitments at January 1	$ 717	$ 939	$ 659	$ 850	$ 1,705	$ 1,093	$ 15
Realized losses					(1,423)	(1,253)	(155)
Provision for re-purchase losses					3,003	1,865	1,233
Allowance for lending-related commitments at December 31	$ 717	$ 939	$ 659	$ 850	$ 3,285	$ 1,705	$ 1,093

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration