TRUST SERIES (Additional Information) (Details)								1 Months Ended				12 Months Ended
	May 08, 2019 USD ($) shares	Jun. 28, 2012 shares	Apr. 13, 2012 shares	Dec. 07, 2011 shares	Nov. 14, 2011 shares	Sep. 06, 2011	Aug. 10, 2010 USD ($) $ / shares shares	Nov. 15, 2011 USD ($) $ / shares shares	Sep. 19, 2011 shares	Jul. 30, 2010	Dec. 21, 2009 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Nov. 10, 2010 USD ($)
Capital Unit
Sponsor capital contribution												$ 1,000	$ 0
Capital contribution to trust series											$ 1,000
Units acquisition | shares											20
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
Future Contract Rebalance Target Weightage												7.14%
United States Commodity Index Fund
Capital Unit
Sponsor capital contribution											$ 1,000	$ 0	$ 0
Units acquisition | shares				40					20
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission										50,000,000
Initial offering price per unit NAV | $ / shares							$ 50.00					$ 36.87	$ 37.49	$ 42.48	$ 40.02
Number of units issued | shares	20						100,000
Value of unit issued							$ 5,000,000
Number of registered units							100,000
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 | Futures Contracts
Capital Unit
Future contract held												4,965
United States Commodity Index Fund | Futures Contracts | NYMEX
Capital Unit
Future contract held												880
United States Commodity Index Fund | Futures Contracts | Ice Futures
Capital Unit
Future contract held												716
United States Commodity Index Fund | Futures Contracts | Chicago Board of Trade
Capital Unit
Future contract held												644
United States Commodity Index Fund | Futures Contracts | Chicago Mercantile Exchange
Capital Unit
Future contract held												480
United States Commodity Index Fund | Futures Contracts | London Metal Exchange
Capital Unit
Future contract held												1,903
United States Commodity Index Fund | Futures Contracts | Commodity Exchange Inc
Capital Unit
Future contract held												342
United States Agriculture Index Fund
Capital Unit
Units acquisition | shares		40	40
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission						20,000,000
United States Copper Index Fund
Capital Unit
Sponsor capital contribution												$ 0	$ 0
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission						30,000,000
Initial offering price per unit NAV | $ / shares								$ 25				$ 17.54	$ 16.44	$ 21.05	$ 16.36
Number of units issued | shares					40			100,000
Value of unit issued								$ 2,500,000
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
Number of shares purchased | shares				40
United States Copper Index Fund | Futures Contracts | Commodity Exchange Inc
Capital Unit
Future contract held												100