ALLOWANCE FOR CREDIT LOSSES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Allowance for credit losses
Allowance for loan losses at beginning of period	$ 17,890		$ 21,580		$ 19,648		$ 25,455
Gross credit losses	(2,586)		(2,974)		(8,381)		(9,675)
Gross recoveries	489	[1]	544	[1]	1,656	[1]	1,759	[1]
NCLs	(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)
Total provision for credit losses	1,575		1,652		4,947		5,693
Other, net	(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 credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of year	1,176	[3]	1,133	[3]	1,229	[3]	1,119	[3]
Provision (release) for unfunded lending commitments	(30)		103		(88)		114
Other, net	(6)		26		(1)		29
Allowance for credit losses on unfunded lending commitments at end of year	1,140	[3]	1,262	[3]	1,140	[3]	1,262	[3]
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 18,055		$ 21,867		$ 18,055		$ 21,867

[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.

[3] Represents additional credit loss reserves for unfunded lending commitments and letters of credit recorded in Other liabilities on the Consolidated Balance Sheet.