Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2008
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	$ 28,799	$ 30,968	$ 58,797
Loans	801,974	799,574
Total Consumer [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	25,542	26,991	40,093
Loans	438,502	438,376
Real estate 1-4 family first mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	25,408	26,839	39,214
Loans	252,841	249,900
Real estate 1-4 family junior lien mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	134	152	728
Loans	70,059	75,465
Credit Card [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	0	0
Loans	24,815	24,640
Automobile [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	0	0	151
Loans	48,648	45,998
Other revolving credit and installment [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans (carrying value)	0	0
Loans	42,139	42,373
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Total Consumer [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	356,901	351,621
30-59 DPD	4,384	5,049
60-89 DPD	1,861	2,282
90-119 DPD	1,077	1,370
120-179 DPD	1,287	1,719
180+ DPD	6,312	7,179
Government insured/guaranteed loans	41,138	42,165
Loans, excluding Purchased Credit Impaired Loans	412,960	411,385
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Real estate 1-4 family first mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	186,212	179,870
30-59 DPD	3,034	3,295
60-89 DPD	1,256	1,528
90-119 DPD	682	853
120-179 DPD	834	1,141
180+ DPD	5,793	6,655
Government insured/guaranteed loans	29,622	29,719
Loans, excluding Purchased Credit Impaired Loans	227,433	223,061
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Real estate 1-4 family junior lien mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	68,223	73,256
30-59 DPD	468	577
60-89 DPD	272	339
90-119 DPD	192	265
120-179 DPD	259	358
180+ DPD	511	518
Government insured/guaranteed loans	0	0
Loans, excluding Purchased Credit Impaired Loans	69,925	75,313
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Credit Card [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	24,268	23,976
30-59 DPD	166	211
60-89 DPD	118	143
90-119 DPD	95	122
120-179 DPD	168	187
180+ DPD	0	1
Government insured/guaranteed loans	0	0
Loans, excluding Purchased Credit Impaired Loans	24,815	24,640
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Automobile [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	47,889	44,973
30-59 DPD	587	798
60-89 DPD	127	164
90-119 DPD	40	57
120-179 DPD	4	5
180+ DPD	1	1
Government insured/guaranteed loans	0	0
Loans, excluding Purchased Credit Impaired Loans	48,648	45,998
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Other revolving credit and installment [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	30,309	29,546
30-59 DPD	129	168
60-89 DPD	88	108
90-119 DPD	68	73
120-179 DPD	22	28
180+ DPD	7	4
Government insured/guaranteed loans	11,516	12,446
Loans, excluding Purchased Credit Impaired Loans	$ 42,139	$ 42,373

The balance of financing receivables that were acquired with deteriorated credit quality.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

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

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-Name Accounting Standards Codification

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-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 OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

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-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

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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.

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Reflects the net carrying amount of loans and leases held in portfolio, not otherwise defined in the taxonomy, after deducting deferred income, but before deducting the allowance for losses on such loans and leases.

+ References

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

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Financing receivables that are less than 180 days past due but more than 119 days past due and still accruing.

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Financing receivables that are equal to or greater than 180 days past due and still accruing.

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