INTEREST REVENUE AND EXPENSE (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest revenue
Loan interest, including fees	$ 11,308	$ 11,976	$ 34,033	$ 35,991
Deposits with banks	255	294	763	988
Federal funds sold and securities borrowed or purchased under agreements to resell	617	825	2,007	2,670
Investments, including dividends	1,689	1,882	5,178	5,646
Trading account assets	1,491	1,616	4,790	5,008
Other interest	103	144	492	414
Total interest revenue	15,463	16,737	47,263	50,717
Interest expense
Deposits	1,490	1,917	4,749	5,860
Federal funds purchased and securities loaned or sold under agreements to repurchase	561	713	1,800	2,161
Trading account liabilities	46	46	131	151
Short-term borrowings	150	173	461	564
Long-term debt	1,705	2,177	5,299	7,211
Total interest expense	3,952	5,026	12,440	15,947
Net interest revenue	11,511	11,711	34,823	34,770
Provision for loan losses	1,652	2,436	5,693	7,620
Net interest revenue after provision for loan losses	9,859	9,275	29,130	27,150
Insurance fees and charges	$ 267	$ 290	$ 855	$ 959