Loans and Allowance for Credit Losses, Loans by Delinquency Status, Commercial (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2008
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and still accruing	$ 23,082	$ 23,245
Nonaccrual loans	19,526	20,486
Purchased Credit Impaired Loans	29,729	30,968	58,797
Loans	799,966	799,574
Total Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	5,242	5,824
Purchased Credit Impaired Loans	3,502	3,977	18,704
Loans	361,714	361,198
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	1,193	1,422
Purchased Credit Impaired Loans	191	259	4,580
Loans	185,623	187,759
Commercial Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	3,098	3,322
Purchased Credit Impaired Loans	1,839	1,970	5,803
Loans	106,119	106,340
Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	870	1,003
Purchased Credit Impaired Loans	767	877	6,462
Loans	16,650	16,904
Lease Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	25	27
Purchased Credit Impaired Loans	0	0
Loans	12,402	12,424
Foreign Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	56	50
Purchased Credit Impaired Loans	705	871	1,859
Loans	40,920	37,771
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Total Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	351,464	349,973
30-89 DPD and still accruing	1,241	1,121
90+ DPD and still accruing	265	303
Nonaccrual loans	5,242	5,824
Loans, excluding Purchased Credit Impaired Loans	358,212	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	183,759	185,614
30-89 DPD and still accruing	433	417
90+ DPD and still accruing	47	47
Nonaccrual loans	1,193	1,422
Loans, excluding Purchased Credit Impaired Loans	185,432	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	100,399	100,317
30-89 DPD and still accruing	619	503
90+ DPD and still accruing	164	228
Nonaccrual loans	3,098	3,322
Loans, excluding Purchased Credit Impaired Loans	104,280	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	14,827	14,861
30-89 DPD and still accruing	139	136
90+ DPD and still accruing	47	27
Nonaccrual loans	870	1,003
Loans, excluding Purchased Credit Impaired Loans	15,883	16,027
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Lease Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	12,339	12,344
30-89 DPD and still accruing	38	53
90+ DPD and still accruing	0	0
Nonaccrual loans	25	27
Loans, excluding Purchased Credit Impaired Loans	12,402	12,424
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Foreign Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	40,140	36,837
30-89 DPD and still accruing	12	12
90+ DPD and still accruing	7	1
Nonaccrual loans	56	50
Loans, excluding Purchased Credit Impaired Loans	$ 40,215	$ 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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- Definition

Financing receivables that are current.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

-Chapter 8

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

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

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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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

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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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-Publisher AICPA

-Name Statement of Position (SOP)

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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.

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.

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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.

+ References

No definition available.

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