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Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2018 USD ($)
Collateral Amount On Open Futures Contracts	$ 135,097,595
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.87%, 10/04/2018 [Member]
Interest rate	1.87%
Expiration date	10/04/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 10/11/2018 [Member]
Interest rate	1.90%
Expiration date	10/11/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.97%, 10/18/2018 [Member]
Interest rate	1.97%
Expiration date	10/18/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.00%, 10/25/2018 [Member]
Interest rate	2.00%
Expiration date	10/25/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.00%, 11/01/2018 [Member]
Interest rate	2.00%
Expiration date	11/01/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.03%, 11/08/2018 [Member]
Interest rate	2.03%
Expiration date	11/08/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.05%, 11/15/2018 [Member]
Interest rate	2.05%
Expiration date	11/15/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.07%, 11/23/2018 [Member]
Interest rate	2.07%
Expiration date	11/23/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.05%, 11/29/2018 [Member]
Interest rate	2.05%
Expiration date	11/29/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.09%, 12/06/2018 [Member]
Interest rate	2.09%
Expiration date	12/06/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.06%, 12/13/2018 [Member]
Interest rate	2.06%
Expiration date	12/13/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.09%, 12/20/2018 [Member]
Interest rate	2.09%
Expiration date	12/20/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.07%, 12/27/2018 [Member]
Interest rate	2.07%
Expiration date	12/27/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.10%, 1/03/2019 [Member]
Interest rate	2.10%
Expiration date	1/03/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.10%, 1/10/2019 [Member]
Interest rate	2.10%
Expiration date	1/10/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.13%, 1/17/2019 [Member]
Interest rate	2.13%
Expiration date	1/17/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.15%, 1/24/2019 [Member]
Interest rate	2.15%
Expiration date	1/24/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.18%, 1/31/2019 [Member]
Interest rate	2.18%
Expiration date	1/31/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.20%, 2/07/2019 [Member]
Interest rate	2.20%
Expiration date	2/07/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.19%, 2/14/2019 [Member]
Interest rate	2.19%
Expiration date	2/14/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.20%, 2/21/2019 [Member]
Interest rate	2.20%
Expiration date	2/21/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.24%, 2/28/2019 [Member]
Interest rate	2.24%
Expiration date	2/28/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.38%, 3/07/2019 [Member]
Interest rate	2.38%
Expiration date	3/07/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.28%, 3/14/2019 [Member]
Interest rate	2.28%
Expiration date	3/14/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.33%, 3/21/2019 [Member]
Interest rate	2.33%
Expiration date	3/21/2019
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.34%, 3/28/2019 [Member]
Interest rate	2.34%
Expiration date	3/28/2019

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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