Fair Value Disclosures (Roll Forward of Level 3 Assets and Liabilities) (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Realized gains, net	$ 16	$ 224	$ 37	$ 227
Mortgage banking income	(83)	(110)	(178)	(199)
Trading [Member]
Beginning balance	1	19	11	93
Other noninterest income			(3)
Purchases, issuances and settlements		(8)		(6)
Purchases	2		2
Sales	(9)		(9)
Settlements	7
Transfers out of Level 3				(76)
Ending balance	1	11	1	11
States and Political Subdivisions [Member]
Beginning balance	52	201	119	210
Included in other comprehensive income (loss)		(2)	(9)	(1)
Purchases, issuances and settlements		(46)		(56)
Settlements	(52)		(53)
Transfers out of Level 3		(17)	(57)	(17)
Ending balance		136		136
Other Securities [Member]
Beginning balance		9	7	9
Included in other comprehensive income (loss)		(1)	(1)	(1)
Settlements			(1)
Transfers out of Level 3			(5)
Ending balance		8		8
Covered Securities [Member]
Beginning balance	1,059	726	954	668
Interest income	8	18	26	34
Included in other comprehensive income (loss)	(4)	74	83	116
Ending balance	1,063	818	1,063	818
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	8	18	26	34
Mortgage Servicing Rights [Member]
Beginning balance	928	875	830	832
Mortgage banking income	(89)	(263)	(77)	(289)
Purchases, issuances and settlements		53		122
Issuances	40		126
Ending balance	879	665	879	665
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	(60)	(232)	(20)	(227)
Net Derivatives [Member]
Beginning balance	7	1	(25)	(20)
Mortgage banking income	43	36	26	53
Purchases, issuances and settlements		11		15
Issuances	10		21
Settlements	(57)		(19)
Ending balance	3	48	3	48
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	3	48	3	48
Venture Capital and Similar Investments [Member]
Beginning balance	272	261	266	281
Other noninterest income	7	6	15	9
Purchases, issuances and settlements		5		(18)
Purchases	7		12
Sales	(30)		(36)
Settlements	(6)		(7)
Transfers into Level 3	1		1
Transfers out of Level 3	(4)		(4)
Ending balance	247	272	247	272
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	$ 5	$ 4	$ 12	$ 3

Net unrealized gains (losses) included in net income relating to assets and liabilities at end of period

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)
-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.

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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-Paragraph 2
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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (c)(3)
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Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 32
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- Definition

Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans.

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- Definition

The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3)
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Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.

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-Name Regulation S-X (SX)
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-Publisher FASB
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- Definition

Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

+ References

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