TRADING ACCOUNT ASSETS AND LIABILITIES (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Trading account assets and Trading account liabilities
Trading account assets	$ 285,928	$ 320,929
Trading account liabilities	108,762	115,549
Securities sold, not yet purchased
Trading account assets and Trading account liabilities
Trading account liabilities	61,508	63,798
Derivatives, liabilities
Trading account assets and Trading account liabilities
Trading account liabilities	47,254	51,751
Derivatives, assets
Trading account assets and Trading account liabilities
Trading account assets	52,821	54,620
Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Trading account assets and Trading account liabilities
Trading account assets	23,955	31,160
Mortgage-backed securities - Prime
Trading account assets and Trading account liabilities
Trading account assets	1,422	1,248
Mortgage-backed securities - Alt-A
Trading account assets and Trading account liabilities
Trading account assets	721	801
Mortgage-backed securities - Subprime
Trading account assets and Trading account liabilities
Trading account assets	1,211	812
Mortgage-backed securities - Non-U.S. residential
Trading account assets and Trading account liabilities
Trading account assets	723	607
Mortgage-backed securities - Commercial
Trading account assets and Trading account liabilities
Trading account assets	2,574	2,441
Mortgage-backed securities
Trading account assets and Trading account liabilities
Trading account assets	30,606	37,069
U.S. Treasury and federal agency securities
Trading account assets and Trading account liabilities
Trading account assets	14,837	20,356
U.S. Treasury
Trading account assets and Trading account liabilities
Trading account assets	13,537	17,472
Agency obligations
Trading account assets and Trading account liabilities
Trading account assets	1,300	2,884
State and municipal securities
Trading account assets and Trading account liabilities
Trading account assets	3,207	3,806
Foreign government securities
Trading account assets and Trading account liabilities
Trading account assets	74,856	89,239
Corporate
Trading account assets and Trading account liabilities
Trading account assets	30,534	35,224
Equity securities
Trading account assets and Trading account liabilities
Trading account assets	61,776	56,998
Asset-backed securities
Trading account assets and Trading account liabilities
Trading account assets	5,616	5,352
Other trading assets
Trading account assets and Trading account liabilities
Trading account assets	$ 11,675	$ 18,265