Condensed Schedule of Investments (Parenthetical)	9 Months Ended
Sep. 30, 2015 USD ($)
Collateral Amount On Open Futures Contracts	$ 21,063,388
United States \| US Treasury Securities \| Cash Equivalents \| U.S. Treasury Bills 0.10%, 10/01/2015
Interest rate	0.10%
Expiration date	10/1/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.08%, 10/08/2015
Interest rate	0.08%
Expiration date	10/8/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 10/15/2015
Interest rate	0.07%
Expiration date	10/15/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.09%, 10/22/2015
Interest rate	0.09%
Expiration date	10/22/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.06%, 10/29/2015
Interest rate	0.06%
Expiration date	10/29/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.07%, 11/05/2015
Interest rate	0.07%
Expiration date	11/5/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.08%, 11/12/2015
Interest rate	0.08%
Expiration date	11/12/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.08%, 11/19/2015
Interest rate	0.08%
Expiration date	11/19/2015
United States \| US Treasury Securities \| Cash Equivalents \| Us Treasury Bills Securities 9 [Member]
Interest rate	0.09%
Expiration date	11/27/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.09%, 12/24/2015
Interest rate	0.09%
Expiration date	12/24/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.11%, 12/31/2015
Interest rate	0.11%
Expiration date	12/31/2015
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.13%, 1/21/2016
Interest rate	0.13%
Expiration date	1/21/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.15%, 1/28/2016
Interest rate	0.15%
Expiration date	1/28/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.19%, 2/04/2016
Interest rate	0.19%
Expiration date	2/4/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.22%, 2/11/2016
Interest rate	0.22%
Expiration date	2/11/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.20%, 2/18/2016
Interest rate	0.20%
Expiration date	2/18/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.20%, 2/25/2016
Interest rate	0.20%
Expiration date	2/25/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.23%, 3/03/2016
Interest rate	0.23%
Expiration date	3/3/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.26%, 3/10/2016
Interest rate	0.26%
Expiration date	3/10/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.24%, 3/17/2016
Interest rate	0.24%
Expiration date	3/17/2016
United States \| US Treasury Securities \| Cash Equivalents \| U.S.Treasury Bills 0.09%, 3/24/2016
Interest rate	0.09%
Expiration date	3/24/2016