LOANS (Details 5) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Loans
Loans, net of unearned income	$ 643,741	$ 655,464
Corporate
Loans
Total loans	262,061	247,590
Net unearned income (loss)	(472)	(797)
Loans, net of unearned income	261,589	246,793
Corporate | Commercial and industrial
Loans
Loans, net of unearned income	113,847	108,776
Corporate | Financial institutions
Loans
Loans, net of unearned income	62,850	54,317
Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	32,363	31,070
Corporate | Lease financing
Loans
Loans, net of unearned income	2,091	2,015
In U.S. offices | Corporate
Loans
Total loans	114,449	103,705
In U.S. offices | Corporate | Commercial and industrial
Loans
Total loans	30,798	26,985
In U.S. offices | Corporate | Financial institutions
Loans
Total loans	23,982	18,159
In U.S. offices | Corporate | Mortgage and real estate
Loans
Total loans	26,215	24,705
In U.S. offices | Corporate | Installment, revolving credit and other
Loans
Total loans	31,919	32,446
In U.S. offices | Corporate | Lease financing
Loans
Total loans	1,535	1,410
In offices outside the U.S. | Corporate
Loans
Total loans	147,612	143,885
In offices outside the U.S. | Corporate | Commercial and industrial
Loans
Total loans	84,317	82,939
In offices outside the U.S. | Corporate | Financial institutions
Loans
Total loans	40,303	37,739
In offices outside the U.S. | Corporate | Mortgage and real estate
Loans
Total loans	6,276	6,485
In offices outside the U.S. | Corporate | Installment, revolving credit and other
Loans
Total loans	14,581	14,958
In offices outside the U.S. | Corporate | Lease financing
Loans
Total loans	556	605
In offices outside the U.S. | Corporate | Government and official institutions
Loans
Total loans	$ 1,579	$ 1,159