ALLOWANCE FOR CREDIT LOSSES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 21,580	$ 27,611	$ 25,455	$ 30,115
Charge-offs	(2,974)	(4,516)	(9,675)	(13,365)
Recoveries	544	619	1,759	2,119
Replenishment of net charge-offs	2,430	3,897	7,916	11,246
Net reserve builds (releases)	(767)	(860)	(1,715)	(1,715)
Net specific reserve builds (releases)	(11)	(601)	(508)	(1,911)
Other	(197)	(234)	(2,627)	(573)
Allowance for loan losses at the end of period	20,605	25,916	20,605	25,916
Allowance for loan losses:
Determined in accordance with ASC 450-20	14,947		14,947		18,132
Determined in accordance with ASC 310-10-35	5,547		5,547		7,225
Determined in accordance with ASC 310-30	111		111		98
Total allowance for loan losses	20,605	25,916	20,605	25,916
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	624,811		624,811		617,223
Loans individually evaluated for impairment in accordance with ASC 310-10-35	26,749		26,749		32,416
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	793		793		538
Loans held at fair value	5,198		5,198		5,287
Loans, net of unearned income	657,551		657,551		655,464
Corporate
Allowance for credit losses
Allowance for loan losses at the beginning of period	2,708	2,972	2,776	2,879
Charge-offs	(148)	(196)	(305)	(508)
Recoveries	52	79	119	320
Replenishment of net charge-offs	96	117	186	188
Net reserve builds (releases)	18	1	(111)	78
Net specific reserve builds (releases)	(45)	(175)	27	(170)
Other	12	19	1	30
Allowance for loan losses at the end of period	2,693	2,817	2,693	2,817
Allowance for loan losses:
Determined in accordance with ASC 450-20	2,315		2,315		2,429
Determined in accordance with ASC 310-10-35	296		296		284
Determined in accordance with ASC 310-30	82		82		63
Total allowance for loan losses	2,693	2,817	2,693	2,817
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	262,888		262,888		239,849
Loans individually evaluated for impairment in accordance with ASC 310-10-35	2,522		2,522		2,776
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	117		117		112
Loans held at fair value	4,202		4,202		4,056
Loans, net of unearned income	269,729		269,729		246,793
Consumer
Allowance for credit losses
Allowance for loan losses at the beginning of period	18,872	24,639	22,679	27,236
Charge-offs	(2,826)	(4,320)	(9,370)	(12,857)
Recoveries	492	540	1,640	1,799
Replenishment of net charge-offs	2,334	3,780	7,730	11,058
Net reserve builds (releases)	(785)	(861)	(1,604)	(1,793)
Net specific reserve builds (releases)	34	(426)	(535)	(1,741)
Other	(209)	(253)	(2,628)	(603)
Allowance for loan losses at the end of period	17,912	23,099	17,912	23,099
Allowance for loan losses:
Determined in accordance with ASC 450-20	12,632		12,632		15,703
Determined in accordance with ASC 310-10-35	5,251		5,251		6,941
Determined in accordance with ASC 310-30	29		29		35
Total allowance for loan losses	17,912	23,099	17,912	23,099
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	361,923		361,923		377,374
Loans individually evaluated for impairment in accordance with ASC 310-10-35	24,227		24,227		29,640
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	676		676		426
Loans held at fair value	996		996		1,231
Loans, net of unearned income	$ 387,822		$ 387,822		$ 408,671