ALLOWANCE FOR CREDIT LOSSES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 25,455	$ 30,115
Charge-offs	(3,551)	(4,771)
Recoveries	590	816
Replenishment of net charge-offs	2,961	3,955
Net reserve builds (releases)	(308)	(194)
Net specific reserve builds (releases)	(358)	(933)
Other	(1,062)	32
Allowance for loan losses at the end of period	23,727	29,020
Allowance for loan losses:
Determined in accordance with ASC 450-20	17,274		18,132
Determined in accordance with ASC 310-10-35	6,356		7,225
Determined in accordance with ASC 310-30	97		98
Total allowance for loan losses	23,727	29,020
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	610,822		617,223
Loans individually evaluated for impairment in accordance with ASC 310-10-35	29,988		32,416
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	566		538
Loans held at fair value	4,988		5,287
Loans, net of unearned income	646,364		655,464
Corporate
Allowance for credit losses
Allowance for loan losses at the beginning of period	2,776
Charge-offs	(60)
Recoveries	15
Replenishment of net charge-offs	45
Net reserve builds (releases)	(31)
Net specific reserve builds (releases)	42
Other	(8)
Allowance for loan losses at the end of period	2,779
Allowance for loan losses:
Determined in accordance with ASC 450-20	2,394		2,429
Determined in accordance with ASC 310-10-35	324		284
Determined in accordance with ASC 310-30	61		63
Total allowance for loan losses	2,779
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	244,446		239,849
Loans individually evaluated for impairment in accordance with ASC 310-10-35	2,849		2,776
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	107		112
Loans held at fair value	3,786		4,056
Loans, net of unearned income	251,188		246,793
Consumer
Allowance for credit losses
Allowance for loan losses at the beginning of period	22,679
Charge-offs	(3,491)
Recoveries	575
Replenishment of net charge-offs	2,916
Net reserve builds (releases)	(277)
Net specific reserve builds (releases)	(400)
Other	(1,054)
Allowance for loan losses at the end of period	20,948
Allowance for loan losses:
Determined in accordance with ASC 450-20	14,880		15,703
Determined in accordance with ASC 310-10-35	6,032		6,941
Determined in accordance with ASC 310-30	36		35
Total allowance for loan losses	20,948
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	366,376		377,374
Loans individually evaluated for impairment in accordance with ASC 310-10-35	27,139		29,640
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	459		426
Loans held at fair value	1,202		1,231
Loans, net of unearned income	$ 395,176		$ 408,671