Loans and Allowance for Credit Losses, Loans by Delinquency Status, Commercial (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and accruing	$ 22,555	$ 22,569
Nonaccrual loans	22,026	21,304
Purchased Credit Impaired Loans	35,534	36,719
Loans	766,521	769,631
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and accruing	104	153
Nonaccrual loans	1,726	2,142
Purchased Credit Impaired Loans	385	399
Loans	168,546	167,216
Commercial Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and accruing	289	256
Nonaccrual loans	4,081	4,085
Purchased Credit Impaired Loans	3,107	3,270
Loans	105,874	105,975
Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and accruing	25	89
Nonaccrual loans	1,709	1,890
Purchased Credit Impaired Loans	1,564	1,745
Loans	18,549	19,382
Lease Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual loans	45	53
Purchased Credit Impaired Loans	0	0
Loans	13,143	13,117
Foreign Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and accruing	7	6
Nonaccrual loans	38	47
Purchased Credit Impaired Loans	1,198	1,353
Loans	39,637	39,760
Total Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
90+ DPD and accruing	425	504
Nonaccrual loans	7,599	8,217
Purchased Credit Impaired Loans	6,254	6,767
Loans	345,749	345,450
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	165,387	163,583
30-89 DPD and still accruing	944	939
90+ DPD and accruing	104	153
Nonaccrual loans	1,726	2,142
Loans, excluding Purchased Credit Impaired Loans	168,161	166,817
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Commercial Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	97,511	97,410
30-89 DPD and still accruing	886	954
90+ DPD and accruing	289	256
Nonaccrual loans	4,081	4,085
Loans, excluding Purchased Credit Impaired Loans	102,767	102,705
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	15,011	15,471
30-89 DPD and still accruing	240	187
90+ DPD and accruing	25	89
Nonaccrual loans	1,709	1,890
Loans, excluding Purchased Credit Impaired Loans	16,985	17,637
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Lease Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	12,802	12,934
30-89 DPD and still accruing	296	130
90+ DPD and accruing	0	0
Nonaccrual loans	45	53
Loans, excluding Purchased Credit Impaired Loans	13,143	13,117
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Foreign Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	38,300	38,122
30-89 DPD and still accruing	94	232
90+ DPD and accruing	7	6
Nonaccrual loans	38	47
Loans, excluding Purchased Credit Impaired Loans	38,439	38,407
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Total Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD and still accruing	329,011	327,520
30-89 DPD and still accruing	2,460	2,442
90+ DPD and accruing	425	504
Nonaccrual loans	7,599	8,217
Loans, excluding Purchased Credit Impaired Loans	$ 339,495	$ 338,683

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

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

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

-Publisher FASB

-Name Accounting Standards Codification

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Financing receivables that are current.

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

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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

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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

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-Name Statement of Position (SOP)

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

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

-Publisher OTS

-Name Federal Regulation (FR)

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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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