Noninterest Revenue - Investment Banking Fees (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Schedule of Noninterest revenue [Line Items]
Underwriting	$ 752	$ 1,252
Advisory	581	542
Total investment banking fees	1,333	1,794
Equity
Schedule of Noninterest revenue [Line Items]
Underwriting	202	399
Debt
Schedule of Noninterest revenue [Line Items]
Underwriting	$ 550	$ 853

Fees earned for mergers, acquisitions, divestitures, restructurings, and other types of financial advisory services.

No definition available.

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- Definition

Schedule of Non-interest Revenue [Line Items]

+ References

No definition available.

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- Definition

Includes (1) underwriting revenue (the spread between the resale price received and the cost of the securities and related expenses) generated through the purchasing, distributing and reselling of new issues of securities (alternatively, could be a secondary offering of a large block of previously issued securities); and (2) fees earned for mergers, acquisitions, divestitures, restructurings, and other types of financial advisory services.

+ 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 210.9-04.13(b),(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 605
-Section 05
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51673390&loc=d3e44274-110985

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(b))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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