INTEREST REVENUE AND EXPENSE (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest revenue
Loan interest, including fees	$ 48,544	$ 50,281	$ 55,056
Deposits with banks	1,269	1,750	1,252
Federal funds sold and securities borrowed or purchased under agreements to resell	3,418	3,631	3,156
Investments, including dividends	7,525	8,320	11,004
Trading account assets	6,802	8,186	8,079
Other interest	580	513	735
Total interest revenue	68,138	72,681	79,282
Interest expense
Deposits	7,613	8,556	8,371
Federal funds purchased and securities loaned or sold under agreements to repurchase	2,817	3,197	2,808
Trading account liabilities	190	408	379
Short-term borrowings	727	650	917
Long-term debt	9,188	11,423	12,621
Total interest expense	20,535	24,234	25,096
Net interest revenue	47,603	48,447	54,186
Provision for loan losses	10,848	11,773	25,194
Net interest revenue after provision for loan losses	36,755	36,674	28,992
Insurance fees and charges	$ 1,262	$ 1,332	$ 981