Investment Securities (Fair Value of Securities Pledged and Accepted as Collateral) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Investment Securities Disclosure
Pledged to others	$ 23,071	$ 27,985
Permitted by contract or custom to sell or repledge	2,185	3,529
Permitted amount repledged to others	$ 1,083	$ 1,971

This is the fair value as of the date of each statement of financial position presented of the collateral that is permitted by contact or custom to sell or re-pledge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph a(3)

Name:	us-gaap_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant