COMMISSIONS AND FEES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Commissions and fees
Total commissions and fees	$ 2,937	$ 2,725	$ 5,696	$ 5,188
Investment banking
Commissions and fees
Total commissions and fees	916	753	1,778	1,327
Trading-related
Commissions and fees
Total commissions and fees	542	544	1,114	1,145
Trade and securities services
Commissions and fees
Total commissions and fees	422	386	812	792
Credit cards and bank cards
Commissions and fees
Total commissions and fees	364	344	675	615
Corporate finance
Commissions and fees
Total commissions and fees	238	241	407	364
Other consumer
Commissions and fees
Total commissions and fees	169	166	333	324
Checking-related
Commissions and fees
Total commissions and fees	122	104	242	220
Loan servicing
Commissions and fees
Total commissions and fees	88	68	174	164
Other
Commissions and fees
Total commissions and fees	$ 76	$ 119	$ 161	$ 237