COMMISSIONS AND FEES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commissions and fees
Total commissions and fees	$ 2,644	$ 2,732	$ 7,832	$ 9,096
Investment banking
Commissions and fees
Total commissions and fees	726	692	2,053	2,590
Trading-related
Commissions and fees
Total commissions and fees	519	566	1,664	1,816
Trade and securities services
Commissions and fees
Total commissions and fees	384	428	1,176	1,311
Credit cards and bank cards
Commissions and fees
Total commissions and fees	372	415	987	1,413
Corporate finance
Commissions and fees
Total commissions and fees	164	113	528	384
Other consumer
Commissions and fees
Total commissions and fees	173	160	497	522
Checking-related
Commissions and fees
Total commissions and fees	140	128	360	374
Loan servicing
Commissions and fees
Total commissions and fees	71	103	235	317
Other
Commissions and fees
Total commissions and fees	$ 95	$ 127	$ 332	$ 369