Fair Value Disclosures (Roll Forward of Level 3 Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Mortgage banking income	$ 168	$ 182	$ 348	$ 398
Trading [Member]
Beginning balance	1	1	1	1
Interest income	0	0	0	0
Mortgage banking income	0	0	0	0
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI (loss)	0	0	0	0
Purchases	11	0	11	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Ending balance	12	1	12	1
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	0	0	0	0
Covered Securities [Member]
Beginning balance	996	1,023	994	984
Interest income	8	14	18	18
Mortgage banking income	0	0	0	0
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI (loss)	(15)	(22)	10	40
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(36)	(33)	(69)	(60)
Ending balance	953	982	953	982
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	8	14	18	18
Residential MSR [Member]
Beginning balance	735	696	627	563
Interest income	0	0	0	0
Mortgage banking income	100	(130)	155	(39)
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI (loss)	0	0	0	0
Purchases	0	0	0	0
Issuances	98	50	192	134
Sales	0	0	0	0
Settlements	(41)	(38)	(82)	(80)
Ending balance	892	578	892	578
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	100	(130)	155	(39)
Net Derivatives [Member]
Beginning balance	35	30	54	59
Interest income	0	0	0	0
Mortgage banking income	30	89	65	185
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI (loss)	0	0	0	0
Purchases	0	0	0	0
Issuances	(9)	77	27	138
Sales	0	0	0	0
Settlements	(145)	(128)	(235)	(314)
Ending balance	(89)	68	(89)	68
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	(89)	68	(89)	68
Private Equity and Similar Investments
Beginning balance	330	281	323	261
Interest income	0	0	0	0
Mortgage banking income	0	0	0	0
Other noninterest income	6	(1)	11	4
Included in unrealized net holding gains (losses) in OCI (loss)	0	0	0	0
Purchases	7	28	30	52
Issuances	0	0	0	0
Sales	(70)	(6)	(89)	(18)
Settlements	(4)	(1)	(6)	2
Ending balance	269	301	269	301
Net unrealized gains (losses) included in net income relating to level three assets and liabilities at end of period	$ 5	$ (2)	$ 8	$ 7

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

No definition available.

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- Definition

Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

+ Details

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- Definition

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

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

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.

+ References

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- Definition

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.

+ References

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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 Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-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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- 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.

+ References

No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(b))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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