Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans, Carrying Value	$ 35,534	$ 36,719
Loans	766,521	769,631
Real estate 1-4 family first mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans, Carrying Value	29,082	29,746
Loans	228,885	228,894
Real estate 1-4 family junior lien mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans, Carrying Value	198	206
Loans	83,173	85,991
Credit Card [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans, Carrying Value	0	0
Loans	21,998	22,836
Other revolving credit and installment [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans, Carrying Value	0	0
Loans	86,716	86,460
Total Consumer [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Purchased Credit Impaired Loans, Carrying Value	29,280	29,952
Loans	420,772	424,181
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Real estate 1-4 family first mortgage [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	157,697	156,985
30-59 DPD	3,573	4,075
60-89 DPD	1,671	2,012
90-119 DPD	944	1,152
120-179 DPD	1,426	1,704
180+ DPD	6,589	6,665
Government insured/guaranteed loans	27,903	26,555
Loans, excluding Purchased Credit Impaired Loans	199,803	199,148
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	80,518	83,033
30-59 DPD	678	786
60-89 DPD	424	501
90-119 DPD	333	382
120-179 DPD	492	537
180+ DPD	530	546
Government insured/guaranteed loans	0	0
Loans, excluding Purchased Credit Impaired Loans	82,975	85,785
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Credit Card [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	21,387	22,125
30-59 DPD	163	211
60-89 DPD	129	154
90-119 DPD	115	135
120-179 DPD	204	211
180+ DPD	0	0
Government insured/guaranteed loans	0	0
Loans, excluding Purchased Credit Impaired Loans	21,998	22,836
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Other revolving credit and installment [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	70,868	69,712
30-59 DPD	749	963
60-89 DPD	198	275
90-119 DPD	110	127
120-179 DPD	30	33
180+ DPD	5	4
Government insured/guaranteed loans	14,756	15,346
Loans, excluding Purchased Credit Impaired Loans	86,716	86,460
Loans Excluding Purchased Credit-Impaired Loans [Member] \| Total Consumer [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current-29 DPD	330,470	331,855
30-59 DPD	5,163	6,035
60-89 DPD	2,422	2,942
90-119 DPD	1,502	1,796
120-179 DPD	2,152	2,485
180+ DPD	7,124	7,215
Government insured/guaranteed loans	42,659	41,901
Loans, excluding Purchased Credit Impaired Loans	$ 391,492	$ 394,229

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

-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524

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- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

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

-Publisher FASB

-Name Accounting Standards Codification

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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

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-Publisher FASB

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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

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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)

-Number Title 12

-Chapter V

-Section 563c.102

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- Definition

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

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

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