Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Changes in Repurchase Liability (Details 2) (USD $) In Millions					3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009	Jun. 30, 2011 Repurchase Liability [Member]	Jun. 30, 2010 Repurchase Liability [Member]	Jun. 30, 2011 Repurchase Liability [Member]	Jun. 30, 2010 Repurchase Liability [Member]	Jun. 30, 2011 Repurchase Make-Whole Settlements [Member]	Jun. 30, 2010 Repurchase Make-Whole Settlements [Member]	Jun. 30, 2011 Repurchase Make-Whole Settlements [Member]	Jun. 30, 2010 Repurchase Make-Whole Settlements [Member]
Summary of changes in repurchase liability
Allowance for lending-related commitments at January 1	$ 626	$ 717	$ 912	$ 939	$ 3,474	$ 1,982	$ 3,285	$ 1,705
Realized losses					(241)	(317)	(472)	(563)	(126)	(150)	(241)	(255)
Provision for repurchase losses					398	667	818	1,190
Allowance for lending-related commitments at March 31	$ 626	$ 717	$ 912	$ 939	$ 3,631	$ 2,332	$ 3,631	$ 2,332

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

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