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Condensed Schedule of Investments [Parenthetical] - Jun. 30, 2015 - USD ($)	Total
Collateral amount on open futures contracts	$ 13,124,021
Cash Equivalents [Member] | U.S. Treasury Bills,0.05, 7/09/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.05%
Expiration date	7/9/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.08, 7/23/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.08%
Expiration date	7/23/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.06, 7/30/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.06%
Expiration date	7/30/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.06, 8/06/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.06%
Expiration date	8/6/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.07, 8/13/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	8/13/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.07, 8/20/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	8/20/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.07, 8/27/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	8/27/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.08, 9/03/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.08%
Expiration date	9/3/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.10, 9/10/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.10%
Expiration date	9/10/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.12, 9/17/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.12%
Expiration date	9/17/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.11, 9/24/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.11%
Expiration date	9/24/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.10, 10/01/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.10%
Expiration date	10/1/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.08, 10/08/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.08%
Expiration date	10/8/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.09, 10/15/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.09%
Expiration date	10/15/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.09, 10/22/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.09%
Expiration date	10/22/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.06, 10/29/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.06%
Expiration date	10/29/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.07, 11/05/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	11/5/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.08, 11/12/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.08%
Expiration date	11/12/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.08, 11/19/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.08%
Expiration date	11/19/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.09, 11/27/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.09%
Expiration date	11/27/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.07, 12/03/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	12/3/2015
Cash Equivalents [Member] | U.S. Treasury Bills,0.08, 12/10/2015 [Member] | Us Treasury Securities [Member]
Interest rate	0.08%
Expiration date	12/10/2015
Open Futures Contracts - Long [Member] | ICE Brent Crude Oil Futures CO August 2015 contracts, expiring July 2015 [Member]
Expiration date	July 2015

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