INTEREST REVENUE AND EXPENSE (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest revenue
Loan interest, including fees		$ 10,529	$ 11,361	$ 21,084	$ 22,542
Deposits with banks		168	250	351	502
Federal funds sold and securities borrowed or purchased under agreements to resell		664	592	1,306	1,186
Investments, including dividends		1,770	1,807	3,481	3,564
Trading account assets		1,620	1,454	3,019	2,940
Other interest		122	97	232	177
Total interest revenue	[1]	14,873	15,561	29,473	30,911
Interest expense
Deposits		1,288	1,469	2,613	2,918
Federal funds purchased and securities loaned or sold under agreements to repurchase		443	537	819	1,062
Trading account liabilities		54	48	101	89
Short-term borrowings		157	162	277	299
Long-term debt		1,109	1,399	2,269	2,838
Total interest expense	[1]	3,051	3,615	6,079	7,206
Net interest revenue	[1]	11,822	11,946	23,394	23,705
Provision for loan losses		1,515	1,579	3,270	3,372
Net interest revenue after provision for loan losses		10,307	10,367	20,124	20,333
Insurance fees and charges		$ 289	$ 251	$ 584	$ 532

[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.