ALLOWANCE FOR CREDIT LOSSES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Allowance for credit losses
Allowance for loan losses at the beginning of period	$ 23,727	$ 29,020	$ 25,455	$ 30,115
Gross credit losses	(3,257)	(4,205)	(6,701)	(8,849)
Gross recoveries	649	714	1,215	1,500
Net credit losses (NCLs)	(2,608)	(3,491)	(5,486)	(7,349)
NCLs replenishments	2,608	3,491	5,486	7,349
Net reserve builds (releases)	(642)	(641)	(948)	(855)
Net specific reserve builds (releases)	(139)	(375)	(497)	(1,310)
Total provision for credit losses	1,827	2,475	4,041	5,184
Other, net	(1,366)	(393)	(2,430)	(339)
Allowance for loan losses at the end of period	21,580	27,611	21,580	27,611
Allowance for credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of period	1,132	1,097	1,119	1,136
Provision (release) for unfunded lending commitments	(3)	7	11	(31)
Other, net	4		3	(1)
Allowance for credit losses on unfunded lending commitments at end of period	1,133	1,104	1,133	1,104
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 22,713	$ 28,715	$ 22,713	$ 28,715