Allowance for Credit Losses (Details) (USD $) In Millions	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	$ 31,602	$ 23,164	$ 9,234
Cumulative effect of changes in accounting principles		0	0
Net charge-offs	25,782	24,018	10,764
Gross (recoveries)	(2,109)	(1,053)	(929)
Net charge-offs	23,673	22,965	9,835
Acquired allowance resulting from Washington Mutual transaction	0	0	2,535
Other	21	(332)	(7)
Ending balance at December 31	32,266	31,602	23,164
Provision for loan losses:
Excluding accounting conformity	16,822	31,735	19,660
Accounting conformity	0	0	1,577
Total provision for loan losses	16,822	31,735	21,237
Allowance for loan losses by impairment methodology:
Asset-specific	6,718	6,059	2,494
Formula-based	20,607	23,962	20,670
Purchased credit-impaired	4,941	1,581	0
Loans by impairment methodology:
Asset-specific	21,711	16,853	7,222
Formula-based	590,980	528,985	632,605
Purchased credit-impaired	72,807	81,380	89,088
Retained	685,498	627,218	728,915
Wholesale [Member]
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	7,145	6,545	3,154
Cumulative effect of changes in accounting principles		0	0
Net charge-offs	1,989	3,226	521
Gross (recoveries)	(262)	(94)	(119)
Net charge-offs	1,727	3,132	402
Acquired allowance resulting from Washington Mutual transaction	0	0	229
Other	2	48	28
Ending balance at December 31	4,761	7,145	6,545
Provision for loan losses:
Excluding accounting conformity	(673)	3,684	2,895
Accounting conformity	0	0	641
Total provision for loan losses	(673)	3,684	3,536
Allowance for loan losses by impairment methodology:
Asset-specific	1,574	2,046	712
Formula-based	3,187	5,099	5,833
Loans by impairment methodology:
Asset-specific	5,486	6,960	2,088
Formula-based	216,980	192,982	245,777
Purchased credit-impaired	44	135	224
Retained	222,510	200,077	248,089
Wholesale [Member] \| Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	14
Consumer Excluding Credit Card [Member]
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	14,785	8,927	2,673
Cumulative effect of changes in accounting principles		0	0
Net charge-offs	8,383	10,421	5,086
Gross (recoveries)	(474)	(222)	(209)
Net charge-offs	7,909	10,199	4,877
Acquired allowance resulting from Washington Mutual transaction	0	0	897
Other	10	25	(425)
Ending balance at December 31	16,471	14,785	8,927
Provision for loan losses:
Excluding accounting conformity	9,458	16,032	10,309
Accounting conformity	0	0	350
Total provision for loan losses	9,458	16,032	10,659
Allowance for loan losses by impairment methodology:
Asset-specific	1,075	896	332
Formula-based	10,455	12,308	8,595
Purchased credit-impaired	4,941	1,581	0
Loans by impairment methodology:
Asset-specific	6,220	3,648	2,086
Formula-based	248,481	263,462	285,181
Purchased credit-impaired	72,763	81,245	88,813
Retained	327,464	348,355	376,080
Consumer Excluding Credit Card [Member] \| Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	127
Credit Card [Member]
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	9,672	7,692	3,407
Cumulative effect of changes in accounting principles		0	0
Net charge-offs	15,410	10,371	5,157
Gross (recoveries)	(1,373)	(737)	(601)
Net charge-offs	14,037	9,634	4,556
Acquired allowance resulting from Washington Mutual transaction	0	0	1,409
Other	9	(405)	390
Ending balance at December 31	11,034	9,672	7,692
Provision for loan losses:
Excluding accounting conformity	8,037	12,019	6,456
Accounting conformity	0	0	586
Total provision for loan losses	8,037	12,019	7,042
Allowance for loan losses by impairment methodology:
Asset-specific	4,069	3,117	1,450
Formula-based	6,965	6,555	6,242
Purchased credit-impaired	0	0
Loans by impairment methodology:
Asset-specific	10,005	6,245	3,048
Formula-based	125,519	72,541	101,647
Purchased credit-impaired			51
Retained	135,524	78,786	104,746
Credit Card [Member] \| Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	7,353
Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	$ 7,494

Allowance For Loan Losses Asset Specific.

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Allowance For Loan Losses Formula Based.

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The recorded investment in financing receivables for which impairment is determined on an asset-specific basis.

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The recorded investment in financing receivables for which impairment is determined on a formula basis.

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Impairment methodology.

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- Definition

Loans by impairment methodology.

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The gross carrying amount of loans held for investment, after deducting deferred income, but before deducting the allowance for loan and lease losses.

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The sum of the periodic provision charged to operations, excluding accounting policy conformity adjustment, based on an assessment of the uncollectibility of the loan and lease portfolio, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected).

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- Definition

Provision for loan losses related to the accounting policy conformity adjustment in connection with a business combination.

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- Definition

Reflects the net amount of other additions and reductions in the reserve for credit losses.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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Reflects additions to the reserve for bad debts arising from purchase of loan and lease portfolios.

+ References

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Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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- Definition

For consumer loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable, that have a net carrying amount, the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. Amounts forgiven in a debt restructuring but contingently payable to the investor should be included in the forgiven contract balance, but amounts irrevocably forgiven in a debt restructuring should not be included. Amounts payable to the investor in cash, in kind, and by any other means should be included. Amounts legally discharged should not be included. The outstanding balance does not include amounts that would be accrued under the contract as interest, fees, penalties, and other after the reporting date.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 03-3

-Paragraph 16

-Subparagraph a(1)

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For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 03-3

-Paragraph 15

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-Subparagraph a(1)

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- Definition

The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Subsection I

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

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- Definition

Amount of the cumulative effect of the change in accounting principle on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

-Paragraph 2, 17, 18

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The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected).

+ References

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 5

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

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Total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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