ALLOWANCE FOR CREDIT LOSSES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 30,115	$ 40,655
Gross credit losses	(4,771)	(7,131)
Gross recoveries	816	862
Net credit losses (NCLs)	(3,955)	(6,269)
Replenishment of net charge-offs	3,955	6,269
Net reserve builds (releases)	(194)	(3,482)
Net specific reserve builds	(933)	112
Total provision for credit losses	2,828	2,899
Other, net	32	(717)
Allowance for loan losses at the end of period	29,020	36,568
Allowance for credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of period	1,136	1,066
Provision (release) for unfunded lending commitments	(38)	25
Allowance for credit losses on unfunded lending commitments at end of period	1,097	1,105
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 30,117	$ 37,673