LOANS (Details 5) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Loans
Loans, net of unearned income	$ 648,022	$ 647,242
Corporate
Loans
Total loans	232,707	224,612
Net unearned income (loss)	(788)	(710)
Loans, net of unearned income	231,919	223,902
Corporate | Commercial and industrial
Loans
Loans, net of unearned income	105,419	100,235
Corporate | Loans to financial institutions
Loans
Loans, net of unearned income	66,901	61,543
Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	29,115	27,485
Corporate | Lease financing
Loans
Loans, net of unearned income	1,844	1,838
In U.S. offices | Corporate
Loans
Total loans	92,098	91,911
In U.S. offices | Corporate | Commercial and industrial
Loans
Total loans	22,746	21,667
In U.S. offices | Corporate | Loans to financial institutions
Loans
Total loans	36,303	33,265
In U.S. offices | Corporate | Mortgage and real estate
Loans
Total loans	22,270	20,698
In U.S. offices | Corporate | Installment, revolving credit and other
Loans
Total loans	9,501	15,011
In U.S. offices | Corporate | Lease financing
Loans
Total loans	1,278	1,270
In offices outside the U.S. | Corporate
Loans
Total loans	140,609	132,701
In offices outside the U.S. | Corporate | Commercial and industrial
Loans
Total loans	83,951	79,764
In offices outside the U.S. | Corporate | Loans to financial institutions
Loans
Total loans	32,280	29,794
In offices outside the U.S. | Corporate | Mortgage and real estate
Loans
Total loans	6,974	6,885
In offices outside the U.S. | Corporate | Installment, revolving credit and other
Loans
Total loans	15,341	14,114
In offices outside the U.S. | Corporate | Lease financing
Loans
Total loans	566	568
In offices outside the U.S. | Corporate | Government and official institutions
Loans
Total loans	$ 1,497	$ 1,576