The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References+ Details

Investment Securities (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Investment Securities (Narrative) (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 securities employees years	Sep. 30, 2010	Dec. 31, 2010
Aggregate investment securities carried	$ 45,020,000,000		$ 45,020,000,000		$ 44,810,000,000
Net impairment losses	10,000,000	74,000,000	56,000,000	224,000,000
Recovery of claimed amounts			20.00%
Gross pre-tax unrealized losses on securities			1,870,000,000
Number of investment securities			1,773
Asset-Backed Securities [Member]
Credit-related other-than-temporary impairment	1,000,000	59,000,000	9,000,000	158,000,000
Sub-Prime [Member]
Credit-related other-than-temporary impairment		6,000,000	2,000,000	26,000,000
Alt-A [Member]
Credit-related other-than-temporary impairment		19,000,000	3,000,000
Non-Agency Prime [Member]
Credit-related other-than-temporary impairment	$ 1,000,000	$ 34,000,000	$ 4,000,000	$ 89,000,000
Federal Family Education Loan Program [Member]
Federal government credit support guarantee, percentage minimum			97.00%
Collective credit support, percentage minimum			100.00%