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Condensed Schedule of Investments [Parenthetical] | 3 Months Ended
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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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