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Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2018 USD ($)
Collateral Amount on Open Futures Contracts	$ 262,249
Interest Rate	0.005%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.87%, 10/04/2018 [Member]
Expiration date	10/04/2018
Interest Rate	1.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.97%, 10/18/2018 [Member]
Expiration date	10/18/2018
Interest Rate	1.97%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.00%, 10/25/2018 [Member]
Expiration date	10/25/2018
Interest Rate	2.00%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.00%, 11/01/2018 [Member]
Expiration date	11/01/2018
Interest Rate	2.00%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.03%, 11/08/2018 [Member]
Expiration date	11/08/2018
Interest Rate	2.03%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.05%, 11/15/2018 [Member]
Expiration date	11/15/2018
Interest Rate	2.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.07%, 11/23/2018 [Member]
Expiration date	11/23/2018
Interest Rate	2.07%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.05%, 11/29/2018 [Member]
Expiration date	11/29/2018
Interest Rate	2.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.09%, 12/06/2018 [Member]
Expiration date	12/06/2018
Interest Rate	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.06%, 12/13/2018 [Member]
Expiration date	12/13/2018
Interest Rate	2.06%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.09%, 12/20/2018 [Member]
Expiration date	12/20/2018
Interest Rate	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.07%, 12/27/2018 [Member]
Expiration date	12/27/2018
Interest Rate	2.07%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.10%, 1/03/2019 [Member]
Expiration date	1/03/2019
Interest Rate	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.10%, 1/10/2019 [Member]
Expiration date	1/10/2019
Interest Rate	2.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.13%, 1/17/2019 [Member]
Expiration date	1/17/2019
Interest Rate	2.13%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.15%, 1/24/2019 [Member]
Expiration date	1/24/2019
Interest Rate	2.15%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.18%, 1/31/2019 [Member]
Expiration date	1/31/2019
Interest Rate	2.18%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.20%, 2/07/2019 [Member]
Expiration date	2/07/2019
Interest Rate	2.20%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.19%, 2/14/2019 [Member]
Expiration date	2/14/2019
Interest Rate	2.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.20%, 2/21/2019 [Member]
Expiration date	2/21/2019
Interest Rate	2.20%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.24%, 2/28/2019 [Member]
Expiration date	2/28/2019
Interest Rate	2.24%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.38%, 3/07/2019 [Member]
Expiration date	3/07/2019
Interest Rate	2.38%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.28%, 3/14/2019 [Member]
Expiration date	3/14/2019
Interest Rate	2.28%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.33%, 3/21/2019 [Member]
Expiration date	3/21/2019
Interest Rate	2.33%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.34%, 3/28/2019 [Member]
Expiration date	3/28/2019
Interest Rate	2.34%

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Amount of assets pledged to secure a debt instrument.

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