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Condensed Schedule of Investments (Parenthetical) | 6 Months Ended
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Jun. 30, 2017 USD ($)
Collateral Amount On Open Futures Contracts | $ 453,625,077
United States [Member] | US Treasury Bill Securities One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.62%
Expiration date | 7/06/2017
United States [Member] | US Treasury Bill Securities Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.59%
Expiration date | 7/13/2017
United States [Member] | US Treasury Bill Securities Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.61%
Expiration date | 7/20/2017
United States [Member] | US Treasury Bill Securities Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.60%
Expiration date | 7/27/2017
United States [Member] | US Treasury Bill Securities Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.63%
Expiration date | 8/03/2017
United States [Member] | US Treasury Bill Securities Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.61%
Expiration date | 8/10/2017
United States [Member] | US Treasury Bill Securities Seven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.65%
Expiration date | 8/17/2017
United States [Member] | US Treasury Bill Securities Eight [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.67%
Expiration date | 8/24/2017
United States [Member] | US Treasury Bill Securities Nine [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.76%
Expiration date | 8/31/2017
United States [Member] | US Treasury Bill Securities Ten [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.84%
Expiration date | 9/07/2017
United States [Member] | US Treasury Bill Securities Eleven [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.87%
Expiration date | 9/14/2017
United States [Member] | US Treasury Bill Securities Twelve [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.87%
Expiration date | 9/21/2017
United States [Member] | US Treasury Bill Securities Thirteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.89%
Expiration date | 9/28/2017
United States [Member] | US Treasury Bill Securities Fourteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.90%
Expiration date | 10/05/2017
United States [Member] | US Treasury Bill Securities Fifteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.92%
Expiration date | 10/12/2017
United States [Member] | US Treasury Bill Securities Sixteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.91%
Expiration date | 10/19/2017
United States [Member] | US Treasury Bill Securities Seventeen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.95%
Expiration date | 10/26/2017
United States [Member] | US Treasury Bill Securities Eighteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.97%
Expiration date | 11/02/2017
United States [Member] | US Treasury Bill Securities Nineteen [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.01%
Expiration date | 11/09/2017
United States [Member] | US Treasury Bill Securities Twenty [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 0.98%
Expiration date | 11/16/2017
United States [Member] | US Treasury Bill Securities Twenty One [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.05%
Expiration date | 11/24/2017
United States [Member] | US Treasury Bill Securities Twenty Two [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.05%
Expiration date | 11/30/2017
United States [Member] | US Treasury Bill Securities Twenty Three [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.08%
Expiration date | 12/07/2017
United States [Member] | US Treasury Bill Securities Twenty Four [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.09%
Expiration date | 12/14/2017
United States [Member] | US Treasury Bill Securities Twenty Five [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.11%
Expiration date | 12/21/2017
United States [Member] | US Treasury Bill Securities Twenty Six [Member] | US Treasury Securities [Member] | Cash Equivalents [Member] |
Interest rate | 1.10%
Expiration date | 12/28/2017

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