ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for credit losses
Allowance for loan losses at beginning of period	$ 14,598	$ 18,923	$ 15,994	$ 19,648
Gross credit losses	(2,335)	(2,812)	(4,793)	(5,795)
Gross recoveries	415	623	916	1,167
NCLs	1,920	2,189	3,877	4,628
Net reserve build (releases)	(199)	(521)	(290)	(1,081)
Net specific reserve builds (releases)	(206)	(89)	(317)	(175)
Total provision for credit losses	1,515	1,579	3,270	3,372
Other, net	(118)	(423)	(1,312)	(502)
Allowance for loan losses at the end of year	14,075	17,890	14,075	17,890
Allowance for credit losses on unfunded lending commitments
Allowance for credit losses on unfunded lending commitments at beginning of year	1,023	1,202	1,063	1,229
Provision (release) for unfunded lending commitments	(48)	(31)	(85)	(58)
Other, net	(2)	5	(5)	5
Allowance for credit losses on unfunded lending commitments at end of year	973	1,176	973	1,176
Total allowance for loans, leases, and unfunded lending commitments at end of period	$ 15,048	$ 19,066	$ 15,048	$ 19,066