Schedule of Investments [Parenthetical] - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Interest rate	0.005%
Collateral amount on open futures contracts	$ 20,732,135	$ 9,152,751
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bill, 0.11%, 1/14/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.11%
Expiration date	1/14/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.13%, 1/21/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.13%
Expiration date	1/21/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.15%, 1/28/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.15%
Expiration date	1/28/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.19%, 2/04/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.19%
Expiration date	02/04/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.22%, 2/11/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.22%
Expiration date	02/11/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.20%, 2/18/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.20%
Expiration date	2/18/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.23%, 3/03/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.23%
Expiration date	03/03/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.26%, 3/10/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.26%
Expiration date	03/10/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.24%, 3/17/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.24%
Expiration date	3/17/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.09%, 3/24/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.09%
Expiration date	3/24/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.07%, 3/31/2016 [Member] \| Us Treasury Securities [Member]
Interest rate	0.07%
Expiration date	3/31/2016
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	04/07/2016
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	05/05/2016
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	05/12/2016
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	06/02/2016
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	06/09/2016
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,0.05%, 01/15/15 [Member] \| Us Treasury Securities [Member]
Interest rate		0.05%
Expiration date		01/15/15
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.05%, 02/26/15 [Member] \| Us Treasury Securities [Member]
Interest rate		0.05%
Expiration date		02/26/15
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.05%, 04/23/15 [Member] \| Us Treasury Securities [Member]
Interest rate		0.05%
Expiration date		04/23/15
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.07%, 05/21/15 [Member] \| Us Treasury Securities [Member]
Interest rate		0.07%
Expiration date		05/21/15
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.10%, 06/25/15 [Member] \| Us Treasury Securities [Member]
Interest rate		0.10%
Expiration date		06/25/15
Open Futures Contracts - Long [Member] \| United States [Member] \| ICE Brent Crude Oil Futures CO February 2016 contracts, expiring January 2016 [Member]
Expiration date	January 2016
Open Futures Contracts - Long [Member] \| United States [Member] \| ICE Brent Crude Oil Futures CO March 2016 contracts, expiring January 2016 [Member]
Expiration date	January 2016
Open Futures Contracts - Long [Member] \| United States [Member] \| ICE Brent Crude Oil Futures CO February 2015 contracts, expiring January 2015 [Member]
Expiration date		January 2015