ALLOWANCE FOR CREDIT LOSSES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 25,455	$ 30,115
Gross credit losses	(3,551)	(4,771)
Gross recoveries	590	816
Net credit losses (NCLs)	(2,961)	(3,955)
NCLs replenishments	2,961	3,955
Net reserve builds (releases)	(308)	(194)
Net specific reserve builds (releases)	(358)	(933)
Total provision for credit losses	2,295	2,828
Other, net	(1,062)	32
Allowance for loan losses at the end of period	23,727	29,020
Allowance for credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of period	1,119	1,136
Provision (release) for unfunded lending commitments	14	(38)
Other, net	(1)	(1)
Allowance for credit losses on unfunded lending commitments at end of period	1,132	1,097
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 24,859	$ 30,117