Schedule of Investments [Parenthetical] - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Interest rate		0.005%
Collateral amount on open futures contracts	$ 8,297,821	$ 20,732,135
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.34%, 01/05/2017 \| Us Treasury Securities [Member]
Interest rate	0.34%
Expiration date	1/05/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.43%, 1/19/2017 \| Us Treasury Securities [Member]
Interest rate	0.43%
Expiration date	1/19/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.40%, 2/02/2017 \| Us Treasury Securities [Member]
Interest rate	0.40%
Expiration date	2/02/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.42%, 2/09/2017 \| Us Treasury Securities [Member]
Interest rate	0.42%
Expiration date	2/09/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.45%, 2/16/2017 \| Us Treasury Securities [Member]
Interest rate	0.45%
Expiration date	2/16/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.45%, 2/23/2017 \| Us Treasury Securities [Member]
Interest rate	0.45%
Expiration date	2/23/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.45%, 3/02/2017 \| Us Treasury Securities [Member]
Interest rate	0.45%
Expiration date	3/02/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.47%, 3/09/2017 \| Us Treasury Securities [Member]
Interest rate	0.47%
Expiration date	3/09/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.50%, 3/16/2017 \| Us Treasury Securities [Member]
Interest rate	0.50%
Expiration date	3/16/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.45%, 3/23/2017 \| Us Treasury Securities [Member]
Interest rate	0.45%
Expiration date	3/23/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.43%, 3/30/2017 \| Us Treasury Securities [Member]
Interest rate	0.43%
Expiration date	3/30/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.46%, 4/06/2017 \| Us Treasury Securities [Member]
Interest rate	0.46%
Expiration date	4/06/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.47%, 4/13/2017 \| Us Treasury Securities [Member]
Interest rate	0.47%
Expiration date	4/13/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.46%, 4/20/2017 \| Us Treasury Securities [Member]
Interest rate	0.46%
Expiration date	4/20/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.47%, 4/27/2017 \| Us Treasury Securities [Member]
Interest rate	0.47%
Expiration date	4/27/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.49%, 5/04/2017 \| Us Treasury Securities [Member]
Interest rate	0.49%
Expiration date	5/04/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.55%, 5/11/2017 \| Us Treasury Securities [Member]
Interest rate	0.55%
Expiration date	5/11/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.60%, 5/18/2017 \| Us Treasury Securities [Member]
Interest rate	0.60%
Expiration date	5/18/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.61%, 5/25/2017 \| Us Treasury Securities [Member]
Interest rate	0.61%
Expiration date	5/25/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.60%, 6/01/2017 \| Us Treasury Securities [Member]
Interest rate	0.60%
Expiration date	6/01/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.62%, 6/08/2017 \| Us Treasury Securities [Member]
Interest rate	0.62%
Expiration date	6/08/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.65%, 6/15/2017 \| Us Treasury Securities [Member]
Interest rate	0.65%
Expiration date	6/15/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.64%, 6/22/2017 \| Us Treasury Securities [Member]
Interest rate	0.64%
Expiration date	6/22/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.60%, 6/29/2017 \| Us Treasury Securities [Member]
Interest rate	0.60%
Expiration date	6/29/2017
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.11%, 1/14/2016 \| 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 \| 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 \| 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 \| Us Treasury Securities [Member]
Interest rate		0.19%
Expiration date		2/04/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.22%, 2/11/2016 \| Us Treasury Securities [Member]
Interest rate		0.22%
Expiration date		2/11/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.20%, 2/18/2016 \| 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 \| Us Treasury Securities [Member]
Interest rate		0.23%
Expiration date		3/03/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.26%, 3/10/2016 \| Us Treasury Securities [Member]
Interest rate		0.26%
Expiration date		3/10/2016
Cash Equivalents [Member] \| United States [Member] \| U.S. Treasury Bills,0.24%, 3/17/2016 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| 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 \| Us Treasury Securities [Member]
Interest rate		0.47%
Expiration date		6/30/2016
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 March 2017 Contracts Expiring January 2017 [Member]
Expiration date	January 2017