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Condensed Schedule of Investments [Parenthetical]	3 Months Ended
	Mar. 31, 2016 USD ($)
Collateral amount on open futures contracts	$ 20,219,937
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.07%, 4/07/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	4/07/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.07%, 4/14/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	4/14/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.11%, 4/21/2016[Member] | Us Treasury Securities [Member]
Interest rate	0.11%
Expiration date	4/21/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.21%, 4/28/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.21%
Expiration date	4/28/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.26%, 5/05/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.26%
Expiration date	5/05/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.33%, 5/12/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.33%
Expiration date	5/12/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.31%, 5/19/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.31%
Expiration date	5/19/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.35%, 5/26/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.35%
Expiration date	5/26/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.43%, 6/02/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.43%
Expiration date	6/02/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.52%, 6/09/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.52%
Expiration date	6/09/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.48%, 6/16/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.48%
Expiration date	6/16/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.46%, 6/23/2016[Member] | Us Treasury Securities [Member]
Interest rate	0.46%
Expiration date	6/23/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.47%, 6/30/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.47%
Expiration date	6/30/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.38%, 7/21/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.38%
Expiration date	7/21/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.42%, 8/04/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.42%
Expiration date	8/04/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.41%, 8/11/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.41%
Expiration date	8/11/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.43%, 8/18/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.43%
Expiration date	8/18/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.45%, 8/25/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.45%
Expiration date	8/25/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills0.48%, 9/01/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.48%
Expiration date	9/01/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.46%, 9/08/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.46%
Expiration date	9/08/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.45%, 9/15/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.45%
Expiration date	9/15/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills 0.44%, 9/22/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.44%
Expiration date	9/22/2016
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills0.38%, 9/29/2016 [Member] | Us Treasury Securities [Member]
Interest rate	0.38%
Expiration date	9/29/2016
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures CO June 2016 contracts, expiring April 2016 [Member]
Expiration date	April 2016

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No definition available.

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- Definition

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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))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13.5(d))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010

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