v3.25.2
Cover
Sep. 29, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Sep. 29, 2025
Entity File Number 001-34833
Entity Registrant Name UNITED STATES COMMODITY INDEX FUNDS TRUST
Entity Central Index Key 0001479247
Entity Tax Identification Number 27-1537655
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1850 Mt. Diablo Boulevard
Entity Address, Address Line Two Suite 640
Entity Address, City or Town Walnut Creek
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94596
City Area Code 510
Local Phone Number 522-9600
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
United States Commodity Index Fund [Member]  
Document Information [Line Items]  
Title of 12(b) Security Shares of United States Commodity Index Fund
Trading Symbol USCI
Security Exchange Name NYSEArca
United States Copper Index Fund [Member]  
Document Information [Line Items]  
Title of 12(b) Security Shares of United States Copper Index Fund
Trading Symbol CPER
Security Exchange Name NYSEArca