LOANS (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012 D	Jun. 30, 2011 D	Jun. 30, 2012 D	Jun. 30, 2011 D	Dec. 31, 2011 D
Loans receivable
Loans at fair value	$ 5,089		$ 5,089		$ 5,265
Loans, net of unearned income	654,968		654,968		647,242
Corporate
Loans receivable
Loans sold and/or reclassified to held-for-sale	714	1,574	1,639	3,718
Number of days past due for reversal of accrued interest and charging to earnings (in days)	90	90	90	90	90
Loans, equal to 30- 89 days past due and accruing	331		331		545
Loans, greater than or equal to 90 days past due and accruing	140		140		183
Loans, total Past due and accruing	471		471		728
Loans, total non-accrual	2,571		2,571		3,236
Loans, total current	238,970		238,970		215,999
Loans at fair value	3,829		3,829		3,939
Loans, net of unearned income	245,841		245,841		223,902
Number of days past due, non-accrual status	90	90	90	90	90
Loans less than this number of days past due are considered current	30	30	30	30	30
Corporate | Commercial and industrial
Loans receivable
Loans, equal to 30- 89 days past due and accruing	62		62		93
Loans, greater than or equal to 90 days past due and accruing	6		6		30
Loans, total Past due and accruing	68		68		123
Loans, total non-accrual	1,023		1,023		1,134
Loans, total current	109,901		109,901		98,157
Loans, net of unearned income	110,992		110,992		99,414
Corporate | Loans to financial institutions
Loans receivable
Loans, equal to 30- 89 days past due and accruing	28		28
Loans, greater than or equal to 90 days past due and accruing					2
Loans, total Past due and accruing	28		28		2
Loans, total non-accrual	537		537		763
Loans, total current	48,060		48,060		42,642
Loans, net of unearned income	48,625		48,625		43,407
Corporate | Mortgage and real estate
Loans receivable
Loans, equal to 30- 89 days past due and accruing	167		167		224
Loans, greater than or equal to 90 days past due and accruing	122		122		125
Loans, total Past due and accruing	289		289		349
Loans, total non-accrual	779		779		1,039
Loans, total current	28,583		28,583		26,908
Loans, net of unearned income	29,651		29,651		28,296
Corporate | Lease financing
Loans receivable
Loans, equal to 30- 89 days past due and accruing	5		5		3
Loans, greater than or equal to 90 days past due and accruing					11
Loans, total Past due and accruing	5		5		14
Loans, total non-accrual	7		7		13
Loans, total current	1,821		1,821		1,811
Loans, net of unearned income	1,833		1,833		1,838
Corporate | Other
Loans receivable
Loans, equal to 30- 89 days past due and accruing	69		69		225
Loans, greater than or equal to 90 days past due and accruing	12		12		15
Loans, total Past due and accruing	81		81		240
Loans, total non-accrual	225		225		287
Loans, total current	50,605		50,605		46,481
Loans, net of unearned income	$ 50,911		$ 50,911		$ 47,008