TRADING ACCOUNT ASSETS AND LIABILITIES (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Trading account assets and Trading account liabilities
Trading account assets	$ 320,929	$ 291,734
Trading account liabilities	115,549	126,082
Mortgage-backed securities
Trading account assets and Trading account liabilities
Trading account assets	37,069	32,739
U.S. government-sponsored agency guaranteed
Trading account assets and Trading account liabilities
Trading account assets	31,160	27,535
Prime
Trading account assets and Trading account liabilities
Trading account assets	1,248	877
Alt-A
Trading account assets and Trading account liabilities
Trading account assets	801	609
Subprime
Trading account assets and Trading account liabilities
Trading account assets	812	989
Non-U.S. residential
Trading account assets and Trading account liabilities
Trading account assets	607	396
Commercial
Trading account assets and Trading account liabilities
Trading account assets	2,441	2,333
U.S. Treasury and federal agency securities
Trading account assets and Trading account liabilities
Trading account assets	20,356	19,399
U.S. Treasury
Trading account assets and Trading account liabilities
Trading account assets	17,472	18,227
Agency obligations
Trading account assets and Trading account liabilities
Trading account assets	2,884	1,172
State and municipal securities
Trading account assets and Trading account liabilities
Trading account assets	3,806	5,364
Foreign government securities
Trading account assets and Trading account liabilities
Trading account assets	89,239	79,551
Corporate
Trading account assets and Trading account liabilities
Trading account assets	35,224	37,026
Derivatives, assets
Trading account assets and Trading account liabilities
Trading account assets	54,620	62,327
Equity securities
Trading account assets and Trading account liabilities
Trading account assets	56,998	33,230
Asset-backed securities
Trading account assets and Trading account liabilities
Trading account assets	5,352	7,071
Other debt securities
Trading account assets and Trading account liabilities
Trading account assets	18,265	15,027
Securities sold, not yet purchased
Trading account assets and Trading account liabilities
Trading account liabilities	63,798	69,809
Derivatives, liabilities
Trading account assets and Trading account liabilities
Trading account liabilities	$ 51,751	$ 56,273

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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