Acquisition and Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income (Loss) From Discontinued Operations, Net Of Taxes
Net interest income	$ 538	$ 564	$ 1,091	$ 1,161
Provision for loan and lease losses			62	(47)
Net interest income (expense) after provision for loan and lease losses	517	572	1,028	1,209
Noninterest income	485	454	957	911
Noninterest expense	714	680	1,417	1,381
Income taxes	57	94	132	205
Income (loss) from discontinued operations, net of taxes	10	(9)	5	(20)
Segment, Discontinued Operations [Member]
Income (Loss) From Discontinued Operations, Net Of Taxes
Net interest income	30	35	61	71
Provision for loan and lease losses	2	30	6	62
Net interest income (expense) after provision for loan and lease losses	28	5	55	9
Noninterest income	2	11	20	20
Noninterest expense	10	9	27	21
Income (loss) before income taxes	16	(15)	8	(32)
Income taxes	6	(6)	3	(12)
Income (loss) from discontinued operations, net of taxes	10	(9)	5	(20)
Education Lending [Member]
Income (Loss) From Discontinued Operations, Net Of Taxes
Income (loss) before income taxes	17	(15)	17	(32)
Income taxes	6	(6)	6	(12)
Income (loss) from discontinued operations, net of taxes	11	(9)	11	(20)
Education Lending [Member] \| Segment, Discontinued Operations [Member]
Income (Loss) From Discontinued Operations, Net Of Taxes
Net interest income	30	35	61	71
Provision for loan and lease losses	2	30	6	62
Net interest income (expense) after provision for loan and lease losses	28	5	55	9
Noninterest income	(2)	(11)	(20)	(21)
Noninterest expense	$ 9	$ 9	$ 18	$ 20

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References+ Details

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

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-Section 45

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-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.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 5

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 29

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.14)

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

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 43

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.12)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

+ Details

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References+ Details

- Definition

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

+ References+ Details