Fair Value (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Percentage of available for sale and trading securities valued using prices obtained from pricing services provided by third party vendors	70.00%		70.00%
Percentage of available for sale and trading securities where prices obtained from the pricing services are used as the primary input into the valuation process	10.00%		10.00%
Percentage of securities valued using prices obtained from pricing services provided by third party vendors	73.00%		73.00%
Percentage of securities where prices obtained from the pricing services are used as the primary input into the valuation process	9.00%		9.00%
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities	$ (142,000,000)	$ (46,000,000)	$ (95,000,000)	$ (353,000,000)
Net unrealized gains (losses) relating to Level 3 assets and liabilities	(189,000,000)	(95,000,000)	(162,000,000)	(458,000,000)
Amortization and accretion included in earnings relating to Level 3 assets and liabilities	26,000,000	40,000,000	81,000,000	107,000,000
Carrying value of equity investments carried at cost and FHLB and FRB stock	$ 2,000,000,000		$ 2,000,000,000		$ 2,400,000,000
Black Rock Series C Preferred Stock [Member]
Total shares accounted for relating to BlackRock Series C Preferred Stock	1.5		1.5
Total shares delivered for relating to BlackRock Series C Preferred Stock	1.3		1.3

This item represents the amount of amortization and accretion included in earnings for the period arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).

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- Definition

This element represents the sum of the carrying values of equity investments carried at cost and FHLB and FRB stock.

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This item represents the amount of the net change in unrealized (holding) gains or losses for the period which are included in the statement of income. Such unrealized (holding) gains or losses relate to those assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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- Definition

This element represents net gains or losses for the period (realized and unrealized), arising from assets and liabilities measure at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

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- Definition

Balance delivered in the quarter related to BlackRock Series C Preferred Stock

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- Definition

Percentage of available for sale and trading securities valued using prices obtained from the pricing services as the primary input into the valuation process.

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- Definition

Percentage of available for sale and trading securities valued using prices obtained from third party vendors.

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- Definition

Percentage of securities (comprised of available for sale and held to maturity securities) valued using prices obtained from third party vendors.

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Percentage of securities (comprised of available for sale and held to maturity securities) valued using prices obtained from the pricing services as the primary input into the valuation process.

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- Definition

Balance held at close of period in number of shares.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column B

-Article 12

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph Column B

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

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-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column B

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

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-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010

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