Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Collateral Amount On Open Futures Contracts	$ 6,997,275	$ 29,320,958
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.13%, 1/21/2016
Interest rate		0.13%
Expiration date		1/21/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.15%, 1/28/2016
Interest rate		0.15%
Expiration date		1/28/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.19%, 2/04/2016
Interest rate		0.19%
Expiration date		2/04/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.22%, 2/11/2016
Interest rate		0.22%
Expiration date		2/11/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.20%, 2/18/2016
Interest rate		0.20%
Expiration date		2/18/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.20%, 2/25/2016
Interest rate		0.20%
Expiration date		2/25/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.23%, 3/03/2016
Interest rate		0.23%
Expiration date		3/03/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.26%, 3/10/2016
Interest rate		0.26%
Expiration date		3/10/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.24%, 3/17/2016
Interest rate		0.24%
Expiration date		3/17/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.09%, 3/24/2016
Interest rate		0.09%
Expiration date		3/24/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 3/31/2016
Interest rate		0.07%
Expiration date		3/31/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 4/07/2016
Interest rate		0.07%
Expiration date		4/07/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 4/14/2016
Interest rate		0.07%
Expiration date		4/14/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.11%, 4/21/2016
Interest rate		0.11%
Expiration date		4/21/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.21%, 4/28/2016
Interest rate		0.21%
Expiration date		4/28/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.26%, 5/05/2016
Interest rate		0.26%
Expiration date		5/05/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.33%, 5/12/2016
Interest rate		0.33%
Expiration date		5/12/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.31%, 5/19/2016
Interest rate		0.31%
Expiration date		5/19/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.35%, 5/26/2016
Interest rate		0.35%
Expiration date		5/26/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.43%, 6/02/2016
Interest rate		0.43%
Expiration date		6/02/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.52%, 6/09/2016
Interest rate		0.52%
Expiration date		6/09/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.48%, 6/16/2016
Interest rate		0.48%
Expiration date		6/16/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.46%, 6/23/2016
Interest rate		0.46%
Expiration date		6/23/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.47%, 6/30/2016
Interest rate		0.47%
Expiration date		6/30/2016
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.34%, 1/05/2017
Interest rate	0.34%
Expiration date	1/05/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.43%, 1/19/2017
Interest rate	0.43%
Expiration date	1/19/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.36%, 1/26/2017
Interest rate	0.36%
Expiration date	1/26/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.40%, 2/02/2017
Interest rate	0.40%
Expiration date	2/02/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.42%, 2/09/2017
Interest rate	0.42%
Expiration date	2/09/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.45%, 2/16/2017
Interest rate	0.45%
Expiration date	2/16/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.45%, 2/23/2017
Interest rate	0.45%
Expiration date	2/23/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.45%, 3/02/2017
Interest rate	0.45%
Expiration date	3/02/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.47%, 3/09/2017
Interest rate	0.47%
Expiration date	3/09/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.50%, 3/16/2017
Interest rate	0.50%
Expiration date	3/16/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.45%, 3/23/2017
Interest rate	0.45%
Expiration date	3/23/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.43%, 3/30/2017
Interest rate	0.43%
Expiration date	3/30/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.46%, 4/06/2017
Interest rate	0.46%
Expiration date	4/06/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.47%, 4/13/2017
Interest rate	0.47%
Expiration date	4/13/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.46%, 4/20/2017
Interest rate	0.46%
Expiration date	4/20/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.47%, 4/27/2017
Interest rate	0.47%
Expiration date	4/27/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.49%, 5/04/2017
Interest rate	0.49%
Expiration date	5/04/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.55%, 5/11/2017
Interest rate	0.55%
Expiration date	5/11/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.60%, 5/18/2017
Interest rate	0.60%
Expiration date	5/18/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.61%, 5/25/2017
Interest rate	0.61%
Expiration date	5/25/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.60%, 6/01/2017
Interest rate	0.60%
Expiration date	6/01/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.62%, 6/08/2017
Interest rate	0.62%
Expiration date	6/08/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.65%, 6/15/2017
Interest rate	0.65%
Expiration date	6/15/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.64%, 6/22/2017
Interest rate	0.64%
Expiration date	6/22/2017
US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.60%, 6/29/2017
Interest rate	0.60%
Expiration date	6/29/2017
NYMEX WTI Crude Oil Futures CL August 2017 contracts, expiring July 2017
Expiration date	July 2017
NYMEX WTI Crude Oil Futures CL September 2017 contracts, expiring August 2017
Expiration date	August 2017
NYMEX WTI Crude Oil Futures CL October 2017 contracts, expiring September 2017
Expiration date	September 2017
NYMEX WTI Crude Oil Futures CL November 2017 contracts, expiring October 2017
Expiration date	October 2017
NYMEX WTI Crude Oil Futures CL December 2017 contracts, expiring November 2017
Expiration date	November 2017
NYMEX WTI Crude Oil Futures CL January 2018 contracts, expiring December 2017
Expiration date	December 2017
United States \| NYMEX WTI Crude Oil Futures CL February 2017 contracts, expiring January 2017 \| Open Futures Contracts, Long
Expiration date	January 2017
United States \| NYMEX WTI Crude Oil Futures CL March 2017 contracts, expiring February 2017 \| Open Futures Contracts, Long
Expiration date	February 2017
United States \| NYMEX WTI Crude Oil Futures CL April 2017 contracts, expiring March 2017 \| Open Futures Contracts, Long
Expiration date	March 2017
United States \| NYMEX WTI Crude Oil Futures CL May 2017 contracts, expiring April 2017 \| Open Futures Contracts, Long
Expiration date	April 2017
United States \| NYMEX WTI Crude Oil Futures CL June 2017 contracts, expiring May 2017 \| Open Futures Contracts, Long
Expiration date	May 2017
United States \| NYMEX WTI Crude Oil Futures CL July 2017 contracts, expiring June 2017 \| Open Futures Contracts, Long
Expiration date	June 2017
United States \| NYMEX WTI Crude Oil Futures CL August 2017 contracts, expiring July 2017 \| Open Futures Contracts, Long
Expiration date		July 2016
United States \| NYMEX WTI Crude Oil Futures CL September 2017 contracts, expiring August 2017 \| Open Futures Contracts, Long
Expiration date		August 2016
United States \| NYMEX WTI Crude Oil Futures CL October 2017 contracts, expiring September 2017 \| Open Futures Contracts, Long
Expiration date		September 2016
United States \| NYMEX WTI Crude Oil Futures CL November 2017 contracts, expiring October 2017 \| Open Futures Contracts, Long
Expiration date		October 2016
United States \| NYMEX WTI Crude Oil Futures CL December 2017 contracts, expiring November 2017 \| Open Futures Contracts, Long
Expiration date		November 2016
United States \| NYMEX WTI Crude Oil Futures CL January 2018 contracts, expiring December 2017 \| Open Futures Contracts, Long
Expiration date		December 2016
United States \| NYMEX WTI Crude Oil Futures CL February 2016 contracts, expiring January 2016 \| Open Futures Contracts, Long
Expiration date		January 2016
United States \| NYMEX WTI Crude Oil Futures CL March 2016 contracts, expiring February 2016 \| Open Futures Contracts, Long
Expiration date		February 2016
United States \| NYMEX WTI Crude Oil Futures CL April 2016 contracts, expiring March 2016 \| Open Futures Contracts, Long
Expiration date		March 2016
United States \| NYMEX WTI Crude Oil Futures CL May 2016 contracts, expiring April 2016 \| Open Futures Contracts, Long
Expiration date		April 2016
United States \| NYMEX WTI Crude Oil Futures CL June 2016 contracts, expiring May 2016 \| Open Futures Contracts, Long
Expiration date		May 2016
United States \| NYMEX WTI Crude Oil Futures CL July 2016 contracts, expiring June 2016 \| Open Futures Contracts, Long
Expiration date		June 2016