Noninterest Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Components of noninterest expense [Abstract]
Compensation expense	$ 8,043us-gaap_LaborAndRelatedExpense	$ 7,859us-gaap_LaborAndRelatedExpense
Noncompensation expense:
Occupancy expense	933us-gaap_OccupancyNet	952us-gaap_OccupancyNet
Technology, communications and equipment expense	1,491	1,411
Professional and outside services	1,634	1,786
Marketing	591us-gaap_MarketingAndAdvertisingExpense	564us-gaap_MarketingAndAdvertisingExpense
Other expense	2,191us-gaap_OtherNoninterestExpense	2,064us-gaap_OtherNoninterestExpense
Total noncompensation expense	6,840	6,777
Total noninterest expense	14,883us-gaap_NoninterestExpense	14,636us-gaap_NoninterestExpense
Other expenses, additional details
FDIC related expense	318	293
Threatened or Pending Litigation
Other expenses, additional details
Loss contingency, loss in period	$ 687

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- Definition

Amount of costs of a merger or acquisition including compensation, occupancy, communications, technology, legal, accounting, and other costs that were charged to expense during the period.

+ References

No definition available.

+ Details

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- Details

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- Definition

The amount of expense in the period for communications and data processing expense.

+ References

+ Details

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- Definition

Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

+ References

+ Details

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- Definition

The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

+ References

+ Details

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

+ Details

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- Definition

Total aggregate amount of all noninterest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 14

-Article 9

+ Details

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- Definition

Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.6)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(b))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Other noninterest expenses that are not separately presented in any other noninterest expense category.

+ References

+ Details

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- Definition

Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.

+ References

No definition available.

+ Details

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- Details

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