INTEREST REVENUE AND EXPENSE (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest revenue
Loan interest, including fees		$ 9,985	$ 11,187	$ 30,544	$ 33,729
Deposits with banks		187	235	538	737
Federal funds sold and securities borrowed or purchased under agreements to resell		656	567	1,962	1,753
Investments, including dividends		1,727	1,824	5,194	5,388
Trading account assets		1,498	1,484	4,517	4,424
Other interest		661	215	1,432	392
Total interest revenue	[1]	14,714	15,512	44,187	46,423
Interest expense
Deposits		1,215	1,417	3,828	4,335
Federal funds purchased and securities loaned or sold under agreements to repurchase		379	411	1,198	1,473
Trading account liabilities		57	38	158	127
Short-term borrowings		159	141	436	440
Long-term debt		1,131	1,318	3,400	4,156
Total interest expense	[1]	2,941	3,325	9,020	10,531
Net interest revenue	[1]	11,773	12,187	35,167	35,892
Provision for loan losses		1,582	1,575	4,852	4,947
Net interest revenue after provision for loan losses		10,191	10,612	30,315	30,945
Insurance fees and charges		$ 264	$ 234	$ 849	$ 766

[1] Certain prior-period revenue and expense lines and totals were reclassified to conform to the current period’s presentation. See Note 3 to the Consolidated Financial Statements.