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Condensed Schedule of Investments (Parenthetical)	6 Months Ended
	Jun. 30, 2017 USD ($)
Collateral Amount On Open Futures Contracts	$ 453,625,077
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.62%
Expiration date	7/06/2017
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.59%
Expiration date	7/13/2017
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.61%
Expiration date	7/20/2017
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.60%
Expiration date	7/27/2017
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.63%
Expiration date	8/03/2017
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.61%
Expiration date	8/10/2017
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.65%
Expiration date	8/17/2017
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.67%
Expiration date	8/24/2017
United States [Member] | US Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.76%
Expiration date	8/31/2017
United States [Member] | US Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.84%
Expiration date	9/07/2017
United States [Member] | US Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.87%
Expiration date	9/14/2017
United States [Member] | US Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.87%
Expiration date	9/21/2017
United States [Member] | US Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.89%
Expiration date	9/28/2017
United States [Member] | US Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.90%
Expiration date	10/05/2017
United States [Member] | US Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.92%
Expiration date	10/12/2017
United States [Member] | US Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.91%
Expiration date	10/19/2017
United States [Member] | US Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.95%
Expiration date	10/26/2017
United States [Member] | US Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.97%
Expiration date	11/02/2017
United States [Member] | US Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.01%
Expiration date	11/09/2017
United States [Member] | US Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	0.98%
Expiration date	11/16/2017
United States [Member] | US Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.05%
Expiration date	11/24/2017
United States [Member] | US Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.05%
Expiration date	11/30/2017
United States [Member] | US Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.08%
Expiration date	12/07/2017
United States [Member] | US Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.09%
Expiration date	12/14/2017
United States [Member] | US Treasury Bill Securities Twenty Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.11%
Expiration date	12/21/2017
United States [Member] | US Treasury Bill Securities Twenty Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member]
Interest rate	1.10%
Expiration date	12/28/2017

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Contractual interest rate for funds borrowed, under the debt agreement.

+ 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
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
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