INTEREST REVENUE AND EXPENSE (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Interest revenue
Loan interest, including fees	$ 11,361		$ 11,300		$ 22,542		$ 22,725
Deposits with banks	250		252		502		508
Federal funds sold and securities borrowed or purchased under agreements to resell	592		702		1,186		1,390
Investments, including dividends	1,807		1,687		3,564		3,489
Trading account assets	1,454	[1]	1,669	[1]	2,940	[1]	3,299	[1]
Other interest	97		230		177		389
Total interest revenue	15,561		15,840		30,911		31,800
Interest expense
Deposits	1,469	[2]	1,583	[2]	2,918	[2]	3,259	[2]
Federal funds purchased and securities loaned or sold under agreements to repurchase	537		630		1,062		1,239
Trading account liabilities	48	[1]	43	[1]	89	[1]	85	[1]
Short-term borrowings	162		148		299		311
Long-term debt	1,399		1,754		2,838		3,594
Total interest expense	3,615		4,158		7,206		8,488
Net interest revenue	11,946		11,682		23,705		23,312
Provision for loan losses	1,579		1,827		3,372		4,041
Net interest revenue after provision for loan losses	10,367		9,855		20,333		19,271
Insurance fees and charges	$ 251		$ 289		$ 532		$ 588

[1] Interest expense on Trading account liabilities of ICG is reported as a reduction of interest revenue from Trading account assets.

[2] Includes deposit insurance fees and charges of $251 million and $289 million for the three months ended June 30, 2014 and 2013, respectively, and $532 million and $588 million for the six months ended June 30, 2014 and 2013, respectively.