COMMISSIONS AND FEES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Commissions and fees
Total commissions and fees	$ 3,079	$ 3,557	$ 6,217	$ 6,925
Credit cards and bank cards
Commissions and fees
Total commissions and fees	873	944	1,693	1,809
Investment banking
Commissions and fees
Total commissions and fees	652	812	1,306	1,459
Trading-related
Commissions and fees
Total commissions and fees	552	667	1,160	1,358
Transaction Services
Commissions and fees
Total commissions and fees	363	387	736	761
Other Consumer
Commissions and fees
Total commissions and fees	208	213	424	430
Checking-related
Commissions and fees
Total commissions and fees	227	246	465	471
Loan servicing
Commissions and fees
Total commissions and fees	61	104	101	250
Corporate finance
Commissions and fees
Total commissions and fees	109	171	243	299
Other
Commissions and fees
Total commissions and fees	$ 34	$ 13	$ 89	$ 88