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Condensed Schedule of Investments (Parenthetical) - Jun. 30, 2015 - USD ($)	Total
Collateral Amount On Open Futures Contracts	$ 271,314,431
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.03%
Expiration date	7/02/2015
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.06%
Expiration date	7/09/2015
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.05%
Expiration date	7/16/2015
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.08%
Expiration date	7/23/2015
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.06%
Expiration date	7/30/2015
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.06%
Expiration date	8/06/2015
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	8/13/2015
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	8/20/2015
United States [Member] | Us Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	8/27/2015
United States [Member] | Us Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.08%
Expiration date	9/03/2015
United States [Member] | Us Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.10%
Expiration date	9/10/2015
United States [Member] | Us Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.12%
Expiration date	9/17/2015
United States [Member] | Us Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.11%
Expiration date	9/24/2015
United States [Member] | Us Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.10%
Expiration date	10/01/2015
United States [Member] | Us Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.08%
Expiration date	10/08/2015
United States [Member] | Us Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.09%
Expiration date	10/15/2015
United States [Member] | Us Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.09%
Expiration date	10/22/2015
United States [Member] | Us Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.06%
Expiration date	10/29/2015
United States [Member] | Us Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	11/05/2015
United States [Member] | Us Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.08%
Expiration date	11/12/2015
United States [Member] | Us Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.08%
Expiration date	11/19/2015
United States [Member] | Us Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.09%
Expiration date	11/27/2015
United States [Member] | Us Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.07%
Expiration date	12/03/2015
United States [Member] | Us Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalent [Member]
Interest rate	0.08%
Expiration date	12/10/2015

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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