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Condensed Schedule of Investments (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2017	May 15, 2017
Collateral Amount On Open Futures Contracts	$ 205,001,922
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.46%
Expiration date	April 06, 2017
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.47%
Expiration date	April 13, 2017
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.46%
Expiration date	April 20, 2017
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.47%
Expiration date	April 27, 2017
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.52%
Expiration date	May 04, 2017
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.55%
Expiration date	May 11, 2017
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.60%
Expiration date	May 18, 2017
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.61%
Expiration date	May 25, 2017
United States [Member] | US Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.60%
Expiration date	June 01, 2017
United States [Member] | US Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.62%
Expiration date	June 08, 2017
United States [Member] | US Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.65%
Expiration date	June 15, 2017
United States [Member] | US Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.64%
Expiration date	June 22, 2017
United States [Member] | US Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.60%
Expiration date	June 29, 2017
United States [Member] | US Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.62%
Expiration date	July 06, 2017
United States [Member] | US Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.59%
Expiration date	July 13, 2017
United States [Member] | US Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.61%
Expiration date	July 20, 2017
United States [Member] | US Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.60%
Expiration date	July 27, 2017
United States [Member] | US Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.63%
Expiration date	August 03, 2017
United States [Member] | US Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.61%
Expiration date	August 10, 2017
United States [Member] | US Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.65%
Expiration date	August 17, 2017
United States [Member] | US Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.67%
Expiration date	August 24, 2017
United States [Member] | US Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.76%
Expiration date	August 31, 2017
United States [Member] | US Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.84%
Expiration date	September 07, 2017
United States [Member] | US Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.87%
Expiration date	September 14, 2017
United States [Member] | US Treasury Bill Securities Twenty Five [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.87%
Expiration date	September 21, 2017
United States [Member] | US Treasury Bill Securities Twenty Six [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate		0.89%
Expiration date	September 28, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
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