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Condensed Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Collateral Amount On Open Futures Contracts	$ 144,626,242	$ 249,864,944
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.12%	0.34%
Expiration date	1/04/2018	1/05/2017
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.11%	0.38%
Expiration date	1/11/2018	1/12/2017
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.10%	0.43%
Expiration date	1/18/2018	1/19/2017
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.12%	0.36%
Expiration date	1/25/2018	1/26/2017
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.12%	0.40%
Expiration date	2/01/2018	2/02/2017
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.13%	0.42%
Expiration date	2/08/2018	2/09/2017
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.12%	0.45%
Expiration date	2/15/2018	2/16/2017
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.10%	0.45%
Expiration date	2/22/2018	2/23/2017
United States [Member] | US Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.09%	0.45%
Expiration date	3/01/2018	3/02/2017
United States [Member] | US Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.14%	0.47%
Expiration date	3/08/2018	3/09/2017
United States [Member] | US Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.14%	0.50%
Expiration date	3/15/2018	3/16/2017
United States [Member] | US Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.16%	0.45%
Expiration date	3/22/2018	3/23/2017
United States [Member] | US Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.17%	0.43%
Expiration date	3/29/2018	3/30/2017
United States [Member] | US Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.19%	0.46%
Expiration date	4/05/2018	4/06/2017
United States [Member] | US Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.22%	0.47%
Expiration date	4/12/2018	4/13/2017
United States [Member] | US Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	2.45%	0.46%
Expiration date	4/19/2018	4/20/2017
United States [Member] | US Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.25%	0.47%
Expiration date	4/26/2018	4/27/2017
United States [Member] | US Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.27%	0.52%
Expiration date	5/03/2018	5/04/2017
United States [Member] | US Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.32%	0.55%
Expiration date	5/10/2018	5/11/2017
United States [Member] | US Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.37%	0.60%
Expiration date	5/17/2018	5/18/2017
United States [Member] | US Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.43%	0.61%
Expiration date	5/24/2018	5/25/2017
United States [Member] | US Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.43%	0.60%
Expiration date	5/31/2018	6/01/2017
United States [Member] | US Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.45%	0.62%
Expiration date	6/07/2018	6/08/2017
United States [Member] | US Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.46%	0.65%
Expiration date	6/14/2018	6/15/2017
United States [Member] | US Treasury Bill Securities Twenty Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.49%	0.64%
Expiration date	6/21/2018	6/22/2017
United States [Member] | US Treasury Bill Securities Twenty Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.50%	0.60%
Expiration date	6/28/2018	6/29/2017

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.4(b))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 946
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-Section S99
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