TRADING ACCOUNT ASSETS AND LIABILITIES (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Trading account assets and Trading account liabilities
Trading account assets	$ 308,321	$ 320,929
Trading account liabilities	120,226	115,549
Mortgage-backed securities
Trading account assets and Trading account liabilities
Trading account assets	36,113	37,069
U.S. government-sponsored agency guaranteed
Trading account assets and Trading account liabilities
Trading account assets	29,725	31,160
Prime
Trading account assets and Trading account liabilities
Trading account assets	1,162	1,248
Alt-A
Trading account assets and Trading account liabilities
Trading account assets	674	801
Subprime
Trading account assets and Trading account liabilities
Trading account assets	1,290	812
Non-U.S. residential
Trading account assets and Trading account liabilities
Trading account assets	590	607
Commercial
Trading account assets and Trading account liabilities
Trading account assets	2,672	2,441
U.S. Treasury and federal agency securities
Trading account assets and Trading account liabilities
Trading account assets	18,982	20,356
U.S. Treasury
Trading account assets and Trading account liabilities
Trading account assets	15,349	17,472
Agency obligations
Trading account assets and Trading account liabilities
Trading account assets	3,633	2,884
State and municipal securities
Trading account assets and Trading account liabilities
Trading account assets	4,677	3,806
Foreign government securities
Trading account assets and Trading account liabilities
Trading account assets	85,279	89,239
Corporate
Trading account assets and Trading account liabilities
Trading account assets	33,454	35,224
Derivatives, assets
Trading account assets and Trading account liabilities
Trading account assets	55,300	54,620
Equity securities
Trading account assets and Trading account liabilities
Trading account assets	54,462	56,998
Asset-backed securities
Trading account assets and Trading account liabilities
Trading account assets	5,388	5,352
Other debt securities
Trading account assets and Trading account liabilities
Trading account assets	14,666	18,265
Securities sold, not yet purchased
Trading account assets and Trading account liabilities
Trading account liabilities	67,441	63,798
Derivatives, liabilities
Trading account assets and Trading account liabilities
Trading account liabilities	$ 52,785	$ 51,751

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Implementation Guide (Q and A)

-Number FAS115

-Paragraph 35

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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