The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (c)
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	6 Months Ended
	Jun. 30, 2026	Nov. 15, 2011	Nov. 10, 2010	Aug. 10, 2010
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Income tax interest expense or penalties	$ 0
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
Cash equivalents maturity period	3 months
United States Commodity Index Fund
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Weighted average number of shares outstanding, basic	5
United States Commodity Index Fund \| Creation Baskets
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
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 Commodity Index Fund \| Creation Baskets \| Effective as of May 1, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Weighted average number of shares outstanding, basic	50,000
United States Copper Index Fund
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Weighted average number of shares outstanding, basic	40
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