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Condensed Schedule of Investments	Sep. 30, 2018 USD ($)
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ 126,109,700
Open Futures Contracts - Long [Member] | United States Contracts [Member] | NYMEX WTI Crude Oil Futures CL November 2018 contracts, expiring October 2018 [Member]
Notional Amount	$ 1,629,546,300	[1]
Number of Contracts	23,968	[1]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ 126,109,700	[1]
% of Partners' Capital	7.18%	[1]
Cash Equivalents [Member]
Market Value	$ 1,598,248,323
% of Partners' Capital	91.02%
Cash Equivalents [Member] | United States Treasury Obligations [Member]
Market Value	$ 1,477,248,323
% of Partners' Capital	84.13%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.87%, 10/04/2018 [Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,988,406
% of Partners' Capital	4.27%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 10/11/2018 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,968,667
% of Partners' Capital	3.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.97%, 10/18/2018 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,944,750
% of Partners' Capital	3.41%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.00%, 10/25/2018 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,934,000
% of Partners' Capital	2.84%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.00%, 11/01/2018 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,897,700
% of Partners' Capital	3.41%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.03%, 11/08/2018 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,894,181
% of Partners' Capital	2.84%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.05%, 11/15/2018 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,873,125
% of Partners' Capital	2.84%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.07%, 11/23/2018 [Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,788,736
% of Partners' Capital	3.98%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.05%, 11/29/2018 [Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,767,687
% of Partners' Capital	3.97%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.09%, 12/06/2018 [Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,734,350
% of Partners' Capital	3.97%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.06%, 12/13/2018 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,751,800
% of Partners' Capital	3.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.09%, 12/20/2018 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,724,000
% of Partners' Capital	3.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.07%, 12/27/2018 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,752,292
% of Partners' Capital	2.83%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.10%, 1/03/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,729,097
% of Partners' Capital	2.83%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.10%, 1/10/2019 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,649,867
% of Partners' Capital	3.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.13%, 1/17/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,683,500
% of Partners' Capital	2.83%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.15%, 1/24/2019 [Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,524,826
% of Partners' Capital	3.96%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.18%, 1/31/2019 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,561,817
% of Partners' Capital	3.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.20%, 2/07/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,610,313
% of Partners' Capital	2.83%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.19%, 2/14/2019 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,508,133
% of Partners' Capital	3.39%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.20%, 2/21/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,567,028
% of Partners' Capital	2.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.24%, 2/28/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,538,541
% of Partners' Capital	2.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.38%, 3/07/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,486,479
% of Partners' Capital	2.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.28%, 3/14/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,486,361
% of Partners' Capital	2.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.33%, 3/21/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,453,750
% of Partners' Capital	2.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.34%, 3/28/2019 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,428,917
% of Partners' Capital	2.82%
Cash Equivalents [Member] | United States - Money Market Funds [Member]
Market Value	$ 121,000,000
% of Partners' Capital	6.89%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]
Principal Amount	$ 11,000,000
Market Value	$ 11,000,000
% of Partners' Capital	0.62%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount	$ 60,000,000
Market Value	$ 60,000,000
% of Partners' Capital	3.42%
Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount	$ 50,000,000
Market Value	$ 50,000,000
% of Partners' Capital	2.85%
[1] Collateral amounted to $135,097,595 on open futures contracts.

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