Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2021 USD ($)
United States Commodity Index Fund
Expiration date	7
Collateral Amount	$ 11,711,481
Interest rate on Money Market Funds (as a percent)	0.005%
United States Copper Index Fund
Expiration date	7
Collateral Amount	$ 15,094,341
Goldman Sachs Financial Square Government Fund - Institutional Shares, 0.03% | United States Commodity Index Fund
Interest rate on Money Market Funds (as a percent)	0.03%
Goldman Sachs Financial Square Government Fund - Institutional Shares, 0.03% | United States Copper Index Fund | United States Money Market Funds
Interest rate on Money Market Funds (as a percent)	0.03%
RBC U.S. Government Money Market Fund - Institutional Shares, 0.03% | United States Commodity Index Fund | United States Money Market Funds
Interest rate on Money Market Funds (as a percent)	0.03%
RBC U.S. Government Money Market Fund - Institutional Shares, 0.03% | United States Copper Index Fund | United States Money Market Funds
Interest rate on Money Market Funds (as a percent)	0.03%