Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Collateral Amount On Open Futures Contracts	$ 149,272,014	$ 433,776,173
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.05%, 1/02/2020
Interest rate	2.05%
Expiration date	1/02/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.03%, 1/09/2020
Interest rate	2.03%
Expiration date	1/09/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.01%, 1/16/2020
Interest rate	2.01%
Expiration date	1/16/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.04%, 1/23/2020
Interest rate	2.04%
Expiration date	1/23/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.02%, 1/30/2020
Interest rate	2.02%
Expiration date	1/30/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.89%, 2/06/2020
Interest rate	1.89%
Expiration date	2/06/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.87%, 2/13/2020
Interest rate	1.87%
Expiration date	2/13/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.85%, 2/20/2020
Interest rate	1.85%
Expiration date	2/20/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.85%, 2/27/2020
Interest rate	1.85%
Expiration date	2/27/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.83%, 3/05/2020
Interest rate	1.83%
Expiration date	3/05/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.84%, 3/19/2020
Interest rate	1.84%
Expiration date	3/19/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.88%, 3/26/2020
Interest rate	1.88%
Expiration date	3/26/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.70%, 4/02/2020
Interest rate	1.70%
Expiration date	4/02/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.64%, 4/09/2020
Interest rate	1.64%
Expiration date	4/09/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.60%, 4/16/2020
Interest rate	1.60%
Expiration date	4/16/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.60%, 4/23/2020
Interest rate	1.60%
Expiration date	4/23/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.59%, 4/30/2020
Interest rate	1.59%
Expiration date	4/30/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.54%, 5/07/2020
Interest rate	1.54%
Expiration date	5/07/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.55%, 5/14/2020
Interest rate	1.55%
Expiration date	5/14/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.55%, 5/21/2020
Interest rate	1.55%
Expiration date	5/21/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.58%, 5/28/2020
Interest rate	1.58%
Expiration date	5/28/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.53%, 6/04/2020
Interest rate	1.53%
Expiration date	6/04/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.53%, 6/11/2020
Interest rate	1.53%
Expiration date	6/11/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.54%, 6/18/2020
Interest rate	1.54%
Expiration date	6/18/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 1.57%, 6/25/2020
Interest rate	1.57%
Expiration date	6/25/2020
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.10%, 1/10/2019
Interest rate		2.10%
Expiration date		1/10/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.13%, 1/17/2019
Interest rate		2.13%
Expiration date		1/17/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.15%, 1/24/2019
Interest rate		2.15%
Expiration date		1/24/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.18%, 1/31/2019
Interest rate		2.18%
Expiration date		1/31/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.20%, 2/07/2019
Interest rate		2.20%
Expiration date		2/07/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.19%, 2/14/2019
Interest rate		2.19%
Expiration date		2/14/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.20%, 2/21/2019
Interest rate		2.20%
Expiration date		2/21/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.24%, 2/28/2019
Interest rate		2.24%
Expiration date		2/28/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.38%, 3/07/2019
Interest rate		2.38%
Expiration date		3/07/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.28%, 3/14/2019
Interest rate		2.28%
Expiration date		3/14/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.33%, 3/21/2019
Interest rate		2.33%
Expiration date		3/21/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.34%, 3/28/2019
Interest rate		2.34%
Expiration date		3/28/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.37%, 4/04/2019
Interest rate		2.37%
Expiration date		4/04/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.41%, 4/11/2019
Interest rate		2.41%
Expiration date		4/11/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.42%, 4/18/2019
Interest rate		2.42%
Expiration date		4/18/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.43%, 4/25/2019
Interest rate		2.43%
Expiration date		4/25/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.46%, 5/02/2019
Interest rate		2.46%
Expiration date		5/02/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.47%, 5/09/2019
Interest rate		2.47%
Expiration date		5/09/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.48%, 5/16/2019
Interest rate		2.48%
Expiration date		5/16/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.50%, 5/23/2019
Interest rate		2.50%
Expiration date		5/23/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.49%, 5/30/2019
Interest rate		2.49%
Expiration date		5/30/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.51%, 6/06/2019
Interest rate		2.51%
Expiration date		6/06/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.51%, 6/13/2019
Interest rate		2.51%
Expiration date		6/13/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.49%, 6/20/2019
Interest rate		2.49%
Expiration date		6/20/2019
United States Treasury Obligations \| Cash Equivalents \| U.S. Treasury Bills, 2.49%, 6/27/2019
Interest rate		2.49%
Expiration date		6/27/2019