ALLOWANCE FOR CREDIT LOSSES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 21,580	$ 27,611	$ 25,455	$ 30,115
Gross credit losses	(2,974)	(4,516)	(9,675)	(13,365)
Gross recoveries	544	619	1,759	2,119
Net credit losses (NCLs)	(2,430)	(3,897)	(7,916)	(11,246)
NCLs replenishments	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)
Total provision for credit losses	1,652	2,436	5,693	7,620
Other, net	(197)	(234)	(2,627)	(573)
Allowance for loan losses at the end of period	20,605	25,916	20,605	25,916
Allowance for credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of period	1,133	1,104	1,119	1,136
Provision (release) for unfunded lending commitments	103	(41)	114	(72)
Other, net	26		29	(1)
Allowance for credit losses on unfunded lending commitments at end of period	1,262	1,063	1,262	1,063
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 21,867	$ 26,979	$ 21,867	$ 26,979