LOANS (Details 5) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Loans
Loans, net of unearned income	$ 654,968	$ 647,242
Corporate
Loans
Total loans	246,627	224,612
Net unearned income	(786)	(710)
Loans, net of unearned income	245,841	223,902
Corporate | Commercial and industrial
Loans
Loans, net of unearned income	110,992	99,414
Corporate | Loans to financial institutions
Loans
Loans, net of unearned income	48,625	43,407
Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	29,651	28,296
Corporate | Lease financing
Loans
Loans, net of unearned income	1,833	1,838
In U.S. offices | Corporate
Loans
Total loans	102,395	91,911
In U.S. offices | Corporate | Commercial and industrial
Loans
Total loans	24,889	20,830
In U.S. offices | Corporate | Loans to financial institutions
Loans
Total loans	19,134	15,113
In U.S. offices | Corporate | Mortgage and real estate
Loans
Total loans	23,239	21,516
In U.S. offices | Corporate | Installment, revolving credit and other
Loans
Total loans	33,838	33,182
In U.S. offices | Corporate | Lease financing
Loans
Total loans	1,295	1,270
In offices outside the U.S. | Corporate
Loans
Total loans	144,232	132,701
In offices outside the U.S. | Corporate | Commercial and industrial
Loans
Total loans	87,347	79,764
In offices outside the U.S. | Corporate | Loans to financial institutions
Loans
Total loans	31,302	29,794
In offices outside the U.S. | Corporate | Mortgage and real estate
Loans
Total loans	6,517	6,885
In offices outside the U.S. | Corporate | Installment, revolving credit and other
Loans
Total loans	17,001	14,114
In offices outside the U.S. | Corporate | Lease financing
Loans
Total loans	538	568
In offices outside the U.S. | Corporate | Government and official institutions
Loans
Total loans	$ 1,527	$ 1,576