INTEREST REVENUE AND EXPENSE (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Interest revenue
Loan interest, including fees	$ 11,187		$ 11,308		$ 33,729		$ 34,033
Deposits with banks	235		255		737		763
Federal funds sold and securities borrowed or purchased under agreements to resell	567		617		1,753		2,007
Investments, including dividends	1,824		1,689		5,388		5,178
Trading account assets	1,484	[1]	1,491	[1]	4,424	[1]	4,790	[1]
Other interest	215		103		392		492
Total interest revenue	15,512		15,463		46,423		47,263
Interest expense
Deposits	1,417	[2]	1,490	[2]	4,335	[2]	4,749	[2]
Federal funds purchased and securities loaned or sold under agreements to repurchase	411		561		1,473		1,800
Trading account liabilities	38	[1]	46	[1]	127	[1]	131	[1]
Short-term borrowings	141		150		440		461
Long-term debt	1,318		1,705		4,156		5,299
Total interest expense	3,325		3,952		10,531		12,440
Net interest revenue	12,187		11,511		35,892		34,823
Provision for loan losses	1,575		1,652		4,947		5,693
Net interest revenue after provision for loan losses	10,612		9,859		30,945		29,130
Insurance fees and charges	$ 234		$ 267		$ 766		$ 855

[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 $234 million and $267 million for the three months ended September 30, 2014 and 2013, respectively, and $766 million and $855 million for the nine months ended September 30, 2014 and 2013, respectively.