INTEREST REVENUE AND EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest revenue
Loan interest, including fees	$ 9,760	$ 10,555
Deposits with banks	219	183
Federal funds sold and securities borrowed or purchased under agreements to resell	647	642
Investments, including dividends	1,855	1,711
Trading account assets	1,434	1,399
Other interest	252	110
Total interest revenue	14,167	14,600
Interest expense
Deposits	1,204	1,326
Federal funds purchased and securities loaned or sold under agreements to repurchase	502	376
Trading account liabilities	88	47
Short-term borrowings	100	119
Long-term debt	1,046	1,160
Total interest expense	2,940	3,028
Net interest revenue	11,227	11,572
Provision for loan losses	1,886	1,755
Net interest revenue after provision for loan losses	9,341	9,817
Insurance fees and charges	$ 235	$ 296