COMMISSIONS AND FEES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Commissions and fees
Total commissions and fees	$ 3,304	$ 3,043	$ 9,521	$ 9,968
Credit cards and bank cards
Commissions and fees
Total commissions and fees	896	906	2,589	2,715
Investment banking
Commissions and fees
Total commissions and fees	822	476	2,128	1,935
Trading-related
Commissions and fees
Total commissions and fees	535	679	1,695	2,037
Transaction Services
Commissions and fees
Total commissions and fees	355	387	1,091	1,148
Other Consumer
Commissions and fees
Total commissions and fees	234	230	658	660
Checking-related
Commissions and fees
Total commissions and fees	221	225	686	696
Loan servicing
Commissions and fees
Total commissions and fees	108	30	209	280
Corporate finance
Commissions and fees
Total commissions and fees	136	106	379	405
Other
Commissions and fees
Total commissions and fees	$ (3)	$ 4	$ 86	$ 92