ALLOWANCE FOR CREDIT LOSSES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 27,611	$ 34,362	$ 30,115	$ 40,655
Gross credit losses	(4,638)	(5,217)	(13,726)	(18,254)
Gross recoveries	659	703	2,216	2,324
Net credit losses (NCLs)	(3,979)	(4,514)	(11,510)	(15,930)
NCLs replenishments	3,979	4,514	11,510	15,930
Net reserve builds (releases)	(868)	(1,591)	(1,678)	(7,023)
Net specific reserve builds (releases)	(600)	126	(1,908)	222
Total provision for credit losses	2,511	3,049	7,924	9,129
Other, net	(227)	(845)	(613)	(1,802)
Allowance for loan losses at the end of period	25,916	32,052	25,916	32,052
Allowance for credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of period	1,104	1,097	1,136	1,066
Provision (release) for unfunded lending commitments	(41)	43	(72)	55
Other, net		(1)	(1)	18
Allowance for credit losses on unfunded lending commitments at end of period	1,063	1,139	1,063	1,139
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 26,979	$ 33,191	$ 26,979	$ 33,191