ALLOWANCE FOR CREDIT LOSSES (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Allowance for credit losses
Allowance for loan losses at beginning of period	$ 17,890		$ 21,580		$ 19,648		$ 25,455
Charge-offs	(2,586)		(2,974)		(8,381)		(9,675)
Recoveries	489	[1]	544	[1]	1,656	[1]	1,759	[1]
Replenishment of net charge-offs	2,097		2,430		6,725		7,916
Net reserve builds (releases)	(492)		(767)		(1,573)		(1,715)
Net specific reserve builds (releases)	(30)		(11)		(205)		(508)
Other	(453)	[2]	(197)	[2]	(955)	[2]	(2,627)	[2]
Allowance for loan losses at the end of year	16,915		20,605		16,915		20,605
Allowance for loan losses:
Determined in accordance with ASC 450-20	12,359				12,359				14,634
Determined in accordance with ASC 310-10-35	4,459				4,459				4,901
Determined in accordance with ASC 310-30	97				97				113
Total allowance for loan losses	16,915		20,605		16,915		20,605
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	626,053				626,053				633,679
Loans individually evaluated for impairment in accordance with ASC 310-10-35	22,869				22,869				26,015
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	493				493				749
Loans held at fair value	4,411				4,411				5,029
Loans, net of unearned income	653,826				653,826				665,472
Corporate
Allowance for credit losses
Allowance for loan losses at beginning of period	2,370		2,708		2,584		2,776
Charge-offs	(43)		(148)		(264)		(305)
Recoveries	61		52		126		119
Replenishment of net charge-offs	(18)		96		138		186
Net reserve builds (releases)	(99)		18		(226)		(111)
Net specific reserve builds (releases)	87		(45)		2		27
Other	(18)		12		(20)		1
Allowance for loan losses at the end of year	2,340		2,693		2,340		2,693
Allowance for loan losses:
Determined in accordance with ASC 450-20	1,995				1,995				2,232
Determined in accordance with ASC 310-10-35	267				267				268
Determined in accordance with ASC 310-30	78				78				84
Total allowance for loan losses	2,340		2,693		2,340		2,693
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	271,391				271,391				265,230
Loans individually evaluated for impairment in accordance with ASC 310-10-35	1,666				1,666				2,222
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	85				85				117
Loans held at fair value	4,366				4,366				4,072
Loans, net of unearned income	277,508				277,508				271,641
Consumer
Allowance for credit losses
Allowance for loan losses at beginning of period	15,520		18,872		17,064		22,679
Charge-offs	(2,543)		(2,826)		(8,117)		(9,370)
Recoveries	428		492		1,530		1,640
Replenishment of net charge-offs	2,115		2,334		6,587		7,730
Net reserve builds (releases)	(393)		(785)		(1,347)		(1,604)
Net specific reserve builds (releases)	(117)		34		(207)		(535)
Other	(435)		(209)		(935)		(2,628)
Allowance for loan losses at the end of year	14,575		17,912		14,575		17,912
Allowance for loan losses:
Determined in accordance with ASC 450-20	10,364				10,364				12,402
Determined in accordance with ASC 310-10-35	4,192				4,192				4,633
Determined in accordance with ASC 310-30	19				19				29
Total allowance for loan losses	14,575		17,912		14,575		17,912
Loans, net of unearned income:
Loans collectively evaluated for impairment in accordance with ASC 450-20	354,662				354,662				368,449
Loans individually evaluated for impairment in accordance with ASC 310-10-35	21,203				21,203				23,793
Loans acquired with deteriorated credit quality in accordance with ASC 310-30	408				408				632
Loans held at fair value	45				45				957
Loans, net of unearned income	$ 376,318				$ 376,318				$ 393,831

[1] Recoveries have been reduced by certain collection costs that are incurred only if collection efforts are successful.

[2] The third quarter of 2014 includes a reduction of approximately $259 million related to transfers to held-for-sale (HFS) of various loan portfolios, including a reduction of $151 million related to a transfer of a real estate loan portfolio to HFS and a reduction of approximately $108 million related to the transfer of various EMEA loan portfolios to HFS. Additionally, the third quarter includes a reduction of approximately $181 million related to foreign currency translation. The second quarter of 2014 includes a reduction of approximately $480 million related to the sale or transfers to HFS of various loan portfolios, including a reduction of approximately $204 million and $177 million related to the transfers to HFS of consumer operations in Greece and Spain and $29 million related to the sale of the Honduras consumer business, and $66 million related to a transfer of a real estate loan portfolio to HFS. These amounts are partially offset by foreign currency translation on the entire allowance balance. The first quarter of 2014 includes reductions of approximately $79 million related to the sale or transfer to HFS of various loan portfolios. The third quarter of 2013 includes a reduction of approximately $214 million related to the sale or transfer to HFS of various loan portfolios. The second quarter of 2013 includes a reduction of approximately $650 million related to the sale or transfer to HFS of various U.S. loan portfolios and a reduction of approximately $360 million related to the transfer of Credicard to discontinued operations held for sale. Additionally, a reduction of approximately $90 million related to a transfer to HFS of a loan portfolio in Greece and a reduction of approximately $220 million related to foreign currency translation. The first quarter of 2013 includes reductions of approximately $855 million related to the sale or transfer to HFS of various U.S. loan portfolios and a reduction of approximately $165 million related to a transfer to HFS of a loan portfolio in Greece.