Loans and Allowance for Credit Losses, Loans by Delinquency Status, Commercial (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2008
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and still accruing	$ 22,197	$ 23,245
Nonaccrual loans	17,915	20,486
Purchased Credit Impaired Loans	28,799	30,968	58,797
Loans	801,974	799,574
Total Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	4,455	5,824
Purchased Credit Impaired Loans	3,257	3,977	18,704
Loans	363,472	361,198
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	1,022	1,422
Purchased Credit Impaired Loans	195	259	4,580
Loans	188,758	187,759
Commercial Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	2,708	3,322
Purchased Credit Impaired Loans	1,746	1,970	5,803
Loans	104,673	106,340
Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	665	1,003
Purchased Credit Impaired Loans	602	877	6,462
Loans	16,442	16,904
Lease Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	20	27
Purchased Credit Impaired Loans	0	0
Loans	11,766	12,424
Foreign Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	40	50
Purchased Credit Impaired Loans	714	871	1,859
Loans	41,833	37,771
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Total Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	354,362	349,973
30-89 DPD and still accruing	1,182	1,121
90+ DPD and still accruing	216	303
Nonaccrual loans	4,455	5,824
Loans, excluding Purchased Credit Impaired Loans	360,215	357,221
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	187,020	185,614
30-89 DPD and still accruing	484	417
90+ DPD and still accruing	37	47
Nonaccrual loans	1,022	1,422
Loans, excluding Purchased Credit Impaired Loans	188,563	187,500
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Commercial Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	99,544	100,317
30-89 DPD and still accruing	500	503
90+ DPD and still accruing	175	228
Nonaccrual loans	2,708	3,322
Loans, excluding Purchased Credit Impaired Loans	102,927	104,370
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	15,032	14,861
30-89 DPD and still accruing	139	136
90+ DPD and still accruing	4	27
Nonaccrual loans	665	1,003
Loans, excluding Purchased Credit Impaired Loans	15,840	16,027
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Lease Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	11,739	12,344
30-89 DPD and still accruing	7	53
90+ DPD and still accruing	0	0
Nonaccrual loans	20	27
Loans, excluding Purchased Credit Impaired Loans	11,766	12,424
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Foreign Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	41,027	36,837
30-89 DPD and still accruing	52	12
90+ DPD and still accruing	0	1
Nonaccrual loans	40	50
Loans, excluding Purchased Credit Impaired Loans	$ 41,119	$ 36,900

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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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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Financing receivables that are current.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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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

-Section 50

-Paragraph 4

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

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

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

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

-Subparagraph e

-Chapter V

-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

-Paragraph 116

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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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- Definition

Financing receivables that are less than 90 days past due but more than 29 days past due and still accruing.

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No definition available.

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