LOANS (Details 7) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Loans receivable
Loans at fair value	$ 4,744	$ 5,265	$ 4,351
Loans, net of unearned income	648,022	647,242
Private Banking loans
Loans receivable
Loans, net of unearned income	12,929	12,716
Corporate
Loans receivable
Recorded investment in loans	224,999	215,999
Loans, total non-accrual	2,973	3,236
Loans at fair value	3,430	3,939
Loans, net of unearned income	231,919	223,902
Corporate | Commercial and industrial
Loans receivable
Recorded investment in loans	104,122	98,968
Loans, total non-accrual	1,228	1,144
Loans, net of unearned income	105,419	100,235
Corporate | Loans to financial institutions
Loans receivable
Recorded investment in loans	66,286	60,762
Loans, total non-accrual	615	779
Loans, net of unearned income	66,901	61,543
Corporate | Mortgage and real estate
Loans receivable
Recorded investment in loans	27,843	26,107
Loans, total non-accrual	942	1,029
Loans, net of unearned income	29,115	27,485
Corporate | Lease financing
Loans receivable
Recorded investment in loans	1,831	1,811
Loans, total non-accrual	11	13
Loans, net of unearned income	1,844	1,838
Corporate | Other
Loans receivable
Recorded investment in loans	24,917	28,351
Loans, total non-accrual	177	271
Loans, net of unearned income	25,210	28,862
Corporate | Investment Grade
Loans receivable
Recorded investment in loans	162,113	156,759
Corporate | Investment Grade | Commercial and industrial
Loans receivable
Recorded investment in loans	69,895	67,919
Corporate | Investment Grade | Loans to financial institutions
Loans receivable
Recorded investment in loans	56,658	53,482
Corporate | Investment Grade | Mortgage and real estate
Loans receivable
Recorded investment in loans	11,767	10,068
Corporate | Investment Grade | Lease financing
Loans receivable
Recorded investment in loans	1,202	1,161
Corporate | Investment Grade | Other
Loans receivable
Recorded investment in loans	22,591	24,129
Corporate | Non-Investment Grade
Loans receivable
Recorded investment in loans	53,447	50,488
Corporate | Non-Investment Grade | Commercial and industrial
Loans receivable
Recorded investment in loans	34,296	31,172
Loans, total non-accrual	1,228	1,144
Corporate | Non-Investment Grade | Loans to financial institutions
Loans receivable
Recorded investment in loans	9,628	7,282
Loans, total non-accrual	615	779
Corporate | Non-Investment Grade | Mortgage and real estate
Loans receivable
Recorded investment in loans	3,477	3,672
Loans, total non-accrual	942	1,029
Corporate | Non-Investment Grade | Lease financing
Loans receivable
Recorded investment in loans	631	664
Loans, total non-accrual	11	13
Corporate | Non-Investment Grade | Other
Loans receivable
Recorded investment in loans	2,442	4,462
Loans, total non-accrual	$ 177	$ 271