ALLOWANCE FOR CREDIT LOSSES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 30,115	$ 40,655
Charge-offs	(4,771)	(7,131)
Recoveries	816	862
Replenishment of net charge-offs	3,955	6,269
Net reserve releases	(194)	(3,482)
Net specific reserve builds (releases)	(933)	112
Other	32	(717)
Allowance for loan losses at the end of period	29,020	36,568
Allowance for loan losses:
Determined in accordance with ASC 450-20	20,581		20,742
Determined in accordance with ASC 310-10-35	(8,359)		9,305
Determined in accordance with ASC 310-30	80		68
Total allowance for loan losses	29,020	36,568
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	609,962		606,609
Loans individually evaluated for impairment in accordance with ASC 310-10-35	32,785		34,857
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	531		511
Loans held at fair value	4,744	4,351	5,265
Loans, net of unearned income	648,022		647,242
Corporate
Allowance for credit losses
Allowance for loan losses at the beginning of period	2,879
Charge-offs	(85)
Recoveries	168
Replenishment of net charge-offs	(83)
Net reserve releases	154
Net specific reserve builds (releases)	(4)
Other	28
Allowance for loan losses at the end of period	3,057
Allowance for loan losses:
Determined in accordance with ASC 450-20	2,580		2,408
Determined in accordance with ASC 310-10-35	419		420
Determined in accordance with ASC 310-30	58		51
Total allowance for loan losses	3,057
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	225,029		215,778
Loans individually evaluated for impairment in accordance with ASC 310-10-35	3,293		3,994
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	167		191
Loans held at fair value	3,430		3,939
Loans, net of unearned income	231,919		223,902
Consumer
Allowance for credit losses
Allowance for loan losses at the beginning of period	27,236
Charge-offs	(4,686)
Recoveries	648
Replenishment of net charge-offs	4,038
Net reserve releases	(348)
Net specific reserve builds (releases)	(929)
Other	4
Allowance for loan losses at the end of period	25,963
Allowance for loan losses:
Determined in accordance with ASC 450-20	18,001		18,334
Determined in accordance with ASC 310-10-35	7,940		8,885
Determined in accordance with ASC 310-30	22		17
Total allowance for loan losses	25,963
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	384,933		390,831
Loans individually evaluated for impairment in accordance with ASC 310-10-35	29,492		30,863
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	364		320
Loans held at fair value	1,314		1,326
Loans, net of unearned income	$ 416,103		$ 423,340