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Condensed Schedule of Investments [Parenthetical] (USD $)	3 Months Ended
	Mar. 31, 2015
Collateral amount on open futures contracts	17,978,914
Cash Equivalents [Member] \| U.S. Treasury Bills,0.05%, 4/23/2015 [Member]
Interest rate	0.05%
Expiration date	4/23/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.07, 5/21/2015 [Member]
Interest rate	0.07%
Expiration date	5/21/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.10, 6/25/2015 [Member]
Interest rate	0.10%
Expiration date	6/25/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.05, 7/09/2015 [Member]
Interest rate	0.05%
Expiration date	7/09/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.08, 7/23/2015 [Member]
Interest rate	0.08%
Expiration date	7/23/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.06, 7/30/2015 [Member]
Interest rate	0.06%
Expiration date	7/30/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.06, 8/06/2015 [Member]
Interest rate	0.06%
Expiration date	8/06/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.07, 8/13/2015 [Member]
Interest rate	0.07%
Expiration date	8/13/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.07, 8/20/2015 [Member]
Interest rate	0.07%
Expiration date	8/20/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.07, 8/27/2015 [Member]
Interest rate	0.07%
Expiration date	8/27/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.08, 9/03/2015 [Member]
Interest rate	0.08%
Expiration date	9/03/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.10, 9/10/2015 [Member]
Interest rate	0.10%
Expiration date	9/10/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.12, 9/17/2015 [Member]
Interest rate	0.12%
Expiration date	9/17/2015
Cash Equivalents [Member] \| U.S. Treasury Bills,0.11, 9/24/2015 [Member]
Interest rate	0.11%
Expiration date	9/24/2015
Open Futures Contracts - Long [Member] \| ICE Brent Crude Oil Futures C0 May 2015 contracts, expiring April 15, 2015 [Member]
Expiration date	April 15, 2015