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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 |

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