Condensed Statements of Operations (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
United States Commodity Index Fund
Paid in kind interest as a percentage of total interest income	5.00%	5.00%	5.00%	5.00%
Sponsor capital contribution	$ 0		$ 0		$ 0
United States Copper Index Fund
Paid in kind interest as a percentage of total interest income	5.00%	5.00%	5.00%	5.00%
Sponsor capital contribution	$ 0		$ 0		$ 0
USCF Crescent Crypto Index Fund
Paid in kind interest as a percentage of total interest income					5.00%
United States Commodity Index Funds Trust
Paid in kind interest as a percentage of total interest income	5.00%	5.00%	5.00%	5.00%
Sponsor capital contribution	$ 0		$ 0		$ 0