LOANS (Details 5) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans
Loans, net of unearned income	$ 658,423	$ 647,242
Corporate
Loans
Total loans	251,432	224,612
Net unearned income	(761)	(710)
Loans, net of unearned income	250,671	223,902
Corporate | Commercial and industrial
Loans
Loans, net of unearned income	114,892	99,414
Corporate | Loans to financial institutions
Loans
Loans, net of unearned income	50,576	43,407
Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	30,324	28,296
Corporate | Lease financing
Loans
Loans, net of unearned income	1,968	1,838
In U.S. offices | Corporate
Loans
Total loans	106,034	91,911
In U.S. offices | Corporate | Commercial and industrial
Loans
Total loans	30,056	20,830
In U.S. offices | Corporate | Loans to financial institutions
Loans
Total loans	17,376	15,113
In U.S. offices | Corporate | Mortgage and real estate
Loans
Total loans	24,221	21,516
In U.S. offices | Corporate | Installment, revolving credit and other
Loans
Total loans	32,987	33,182
In U.S. offices | Corporate | Lease financing
Loans
Total loans	1,394	1,270
In offices outside the U.S. | Corporate
Loans
Total loans	145,398	132,701
In offices outside the U.S. | Corporate | Commercial and industrial
Loans
Total loans	85,854	79,764
In offices outside the U.S. | Corporate | Loans to financial institutions
Loans
Total loans	35,014	29,794
In offices outside the U.S. | Corporate | Mortgage and real estate
Loans
Total loans	6,214	6,885
In offices outside the U.S. | Corporate | Installment, revolving credit and other
Loans
Total loans	16,758	14,114
In offices outside the U.S. | Corporate | Lease financing
Loans
Total loans	574	568
In offices outside the U.S. | Corporate | Government and official institutions
Loans
Total loans	$ 984	$ 1,576