LOANS (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Loans receivable
Loans at fair value	$ 4,868		$ 4,868		$ 5,287
Loans, net of unearned income	643,741		643,741		655,464
Corporate
Loans receivable
Loans sold and/or reclassified to held-for-sale	1,143	714	2,172	1,639
Number of days past due for reversal of accrued interest and charging to earnings			90 days		90 days
Loans, equal to 30- 89 days past due and accruing	471		471		344
Loans, greater than or equal to 90 days past due and accruing	142		142		125
Loans, total Past due and accruing	613		613		469
Loans, total non-accrual	2,144		2,144		2,333
Loans, total current	255,005		255,005		239,935
Loans at fair value	3,827		3,827		4,056
Loans, net of unearned income	261,589		261,589		246,793
Number of days past due, non-accrual status			90 days		90 days
Loans less than this number of days past due are considered current			30 days		30 days
Corporate | Commercial and industrial
Loans receivable
Loans, equal to 30- 89 days past due and accruing	38		38		38
Loans, greater than or equal to 90 days past due and accruing	5		5		10
Loans, total Past due and accruing	43		43		48
Loans, total non-accrual	917		917		1,078
Loans, total current	112,887		112,887		107,650
Loans, net of unearned income	113,847		113,847		108,776
Corporate | Financial institutions
Loans receivable
Loans, equal to 30- 89 days past due and accruing	16		16		5
Loans, total Past due and accruing	16		16		5
Loans, total non-accrual	356		356		454
Loans, total current	62,478		62,478		53,858
Loans, net of unearned income	62,850		62,850		54,317
Corporate | Mortgage and real estate
Loans receivable
Loans, equal to 30- 89 days past due and accruing	357		357		224
Loans, greater than or equal to 90 days past due and accruing	130		130		109
Loans, total Past due and accruing	487		487		333
Loans, total non-accrual	616		616		680
Loans, total current	31,260		31,260		30,057
Loans, net of unearned income	32,363		32,363		31,070
Corporate | Leases
Loans receivable
Loans, equal to 30- 89 days past due and accruing	5		5		7
Loans, greater than or equal to 90 days past due and accruing	1		1
Loans, total Past due and accruing	6		6		7
Loans, total non-accrual	188		188		52
Loans, total current	1,897		1,897		1,956
Loans, net of unearned income	2,091		2,091		2,015
Corporate | Other
Loans receivable
Loans, equal to 30- 89 days past due and accruing	55		55		70
Loans, greater than or equal to 90 days past due and accruing	6		6		6
Loans, total Past due and accruing	61		61		76
Loans, total non-accrual	67		67		69
Loans, total current	46,483		46,483		46,414
Loans, net of unearned income	$ 46,611		$ 46,611		$ 46,559