ORGANIZATION AND BUSINESS (Additional Information) (Details) - USD ($)	Dec. 31, 2019	May 08, 2019	Nov. 15, 2011	Nov. 10, 2010	Aug. 10, 2010
ORGANIZATION AND BUSINESS
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets					$ 1,000
United States Commodity Index Fund
ORGANIZATION AND BUSINESS
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets		$ 1,000
United States Commodity Index Fund | Creation Baskets | Effective as of May 1, 2012
ORGANIZATION AND BUSINESS
Number of Units per basket	50,000
United States Commodity Index Fund | Marketing Agent | Prior to May 1, 2012
ORGANIZATION AND BUSINESS
Number of Units per basket	100,000
United States Commodity Index Fund | Creation Basket
ORGANIZATION AND BUSINESS
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	$ 350
United States Copper Index Fund
ORGANIZATION AND BUSINESS
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			$ 1,000	$ 1,000
United States Copper Index Fund | Creation Baskets | Effective as of May 1, 2012
ORGANIZATION AND BUSINESS
Number of Units per basket	50,000