FEDERAL FUNDS/SECURITIES BORROWED, LOANED, AND SUBJECT TO REPURCHASE AGREEMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	$ 212,962	$ 187,950
Gross Amounts Offset on the Consolidated Balance Sheet	69,846	49,401
Net Amounts of Assets Presented on the Consolidated Balance Sheet	143,116	138,549
Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting Upon Counterparty Default	115,426	111,745
Net Amounts	27,690	26,804
Deposits paid for securities borrowed
Gross Amounts of Recognized Assets	127,305	122,665
Net Amounts of Assets Presented on the Consolidated Balance Sheet	127,305	122,665
Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting Upon Counterparty Default	35,519	34,733
Net Amounts	91,786	87,932
Total
Total	340,267	310,615
Gross Amounts Offset on the Consolidated Balance Sheet	69,846	49,401
Net Amounts of Assets Presented on the Consolidated Balance Sheet	270,421	261,214
Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting Upon Counterparty Default	150,945	146,478
Net Amounts	119,476	114,736
Securities sold under agreements to repurchase
Gross Amounts of Recognized Liabilities	262,139	231,731
Gross Amounts Offset on the Consolidated Balance Sheet	69,846	49,401
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	192,293	182,330
Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting Upon Counterparty Default	89,254	104,681
Net Amounts	103,039	77,649
Deposits received for securities loaned
Gross Amounts of Recognized Liabilities	28,647	27,901
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	28,647	27,901
Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting Upon Counterparty Default	14,036	15,579
Net Amounts	14,611	12,322
Total
Gross Amounts of Recognized Liabilities	290,786	259,632
Gross Amounts Offset on the Consolidated Balance Sheet	69,846	49,401
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	220,940	210,231
Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting Upon Counterparty Default	103,290	120,260
Net Amounts	$ 117,650	$ 89,971