LOANS (Details 5) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loans
Loans, net of unearned income	$ 657,551	$ 655,464
Corporate
Loans
Total loans	270,277	247,590
Net unearned income (loss)	(548)	(797)
Loans, net of unearned income	269,729	246,793
Corporate | Commercial and industrial
Loans
Loans, net of unearned income	118,485	108,776
Corporate | Financial institutions
Loans
Loans, net of unearned income	61,628	54,317
Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	34,672	31,070
Corporate | Lease financing
Loans
Loans, net of unearned income	2,031	2,015
In U.S. offices | Corporate
Loans
Total loans	118,494	103,705
In U.S. offices | Corporate | Commercial and industrial
Loans
Total loans	33,936	26,985
In U.S. offices | Corporate | Financial institutions
Loans
Total loans	22,813	18,159
In U.S. offices | Corporate | Mortgage and real estate
Loans
Total loans	29,168	24,705
In U.S. offices | Corporate | Installment, revolving credit and other
Loans
Total loans	31,084	32,446
In U.S. offices | Corporate | Lease financing
Loans
Total loans	1,493	1,410
In offices outside the U.S. | Corporate
Loans
Total loans	151,783	143,885
In offices outside the U.S. | Corporate | Commercial and industrial
Loans
Total loans	86,012	82,939
In offices outside the U.S. | Corporate | Financial institutions
Loans
Total loans	40,403	37,739
In offices outside the U.S. | Corporate | Mortgage and real estate
Loans
Total loans	6,392	6,485
In offices outside the U.S. | Corporate | Installment, revolving credit and other
Loans
Total loans	16,783	14,958
In offices outside the U.S. | Corporate | Lease financing
Loans
Total loans	538	605
In offices outside the U.S. | Corporate | Government and official institutions
Loans
Total loans	$ 1,655	$ 1,159