CONTRACTS AND AGREEMENTS - Additional Information (Details) - USD ($)		9 Months Ended
	May 01, 2018	Sep. 30, 2021
SummerHaven Agreements | United States Commodity Index Fund
Contracts and Agreements
Fee percentage	0.06%
Annual licensing fee	$ 15,000
SummerHaven Agreements | United States Commodity Index Fund | Licensing Agreements
Contracts and Agreements
Fee percentage	0.06%
Annual licensing fee	$ 15,000
Maximum
Contracts and Agreements
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts		$ 8
Maximum | Marketing Agent Agreement
Contracts and Agreements
Fee percentage		10.00%
Minimum
Contracts and Agreements
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts		$ 7
Minimum | Marketing Agent Agreement
Contracts and Agreements
Fee percentage		0.04%
On each Trust Series' assets up to 3 billion | Marketing Agent Agreement
Contracts and Agreements
Fee percentage		0.06%
On each Trust Series' assets up to 3 billion | Maximum | Marketing Agent Agreement
Contracts and Agreements
Base amount for determining fee percentage		$ 3,000,000,000
On each Trust Series' assets in excess of $3 billion | Maximum | Marketing Agent Agreement
Contracts and Agreements
Base amount for determining fee percentage		$ 3,000,000,000