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Condensed Schedule of Investments	Mar. 31, 2018 USD ($)
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ 102,316,280
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL May 2018 contracts, expiring April 2018 [Member]
Notional Amount	$ 1,740,161,400	[1]
Number of Contracts	28,372	[1]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ 102,316,280	[1]
% of Partners' Capital	5.55%	[1]
Cash Equivalents [Member]
Market Value	$ 1,733,142,719
% of Partners' Capital	94.06%
Cash Equivalents [Member] | United States Treasury Obligations [Member]
Market Value	$ 1,673,142,719
% of Partners' Capital	90.80%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.19%, 4/05/2018 [Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,990,125
% of Partners' Capital	4.07%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.22%, 4/12/2018 [Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,977,725
% of Partners' Capital	3.25%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.45%, 4/19/2018 [Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,957,388
% of Partners' Capital	3.80%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.25%, 4/26/2018 [Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,935,417
% of Partners' Capital	4.07%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.27%, 5/03/2018 [Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,916,000
% of Partners' Capital	4.07%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.32%, 5/10/2018 [Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,929,042
% of Partners' Capital	2.71%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.37%, 5/17/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,869,906
% of Partners' Capital	4.06%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.43%, 5/24/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,843,760
% of Partners' Capital	4.06%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.43%, 5/31/2018[Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,834,333
% of Partners' Capital	3.79%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.45%, 6/07/2018 [Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,812,400
% of Partners' Capital	3.79%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.46%, 6/14/2018[Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,821,783
% of Partners' Capital	3.25%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.49%, 6/21/2018[Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,766,900
% of Partners' Capital	3.79%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.50%, 6/28/2018[Member]
Principal Amount	$ 70,000,000
Market Value	$ 69,745,044
% of Partners' Capital	3.78%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.56%, 7/05/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,795,486
% of Partners' Capital	2.70%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.56%, 7/12/2018[Member]
Principal Amount	$ 60,000,000
Market Value	$ 59,736,500
% of Partners' Capital	3.24%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.60%, 7/19/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,759,292
% of Partners' Capital	2.70%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.61%, 7/26/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,614,542
% of Partners' Capital	4.05%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.63%, 8/02/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,723,250
% of Partners' Capital	2.70%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.71%, 8/09/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,693,958
% of Partners' Capital	2.70%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.77%, 8/16/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,499,094
% of Partners' Capital	4.04%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.82%, 8/23/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,460,000
% of Partners' Capital	4.04%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.82%, 8/30/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,432,177
% of Partners' Capital	4.04%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.85%, 9/06/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,598,417
% of Partners' Capital	2.69%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 9/13/2018[Member]
Principal Amount	$ 75,000,000
Market Value	$ 74,352,031
% of Partners' Capital	4.03%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.92%, 9/20/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,544,917
% of Partners' Capital	2.69%
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 9/27/2018[Member]
Principal Amount	$ 50,000,000
Market Value	$ 49,533,232
% of Partners' Capital	2.69%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member]
Market Value	$ 60,000,000
% of Partners' Capital	3.26%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]
Principal Amount	$ 30,000,000
Market Value	$ 30,000,000
% of Partners' Capital	1.63%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount	$ 10,000,000
Market Value	$ 10,000,000
% of Partners' Capital	0.54%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount	$ 20,000,000
Market Value	$ 20,000,000
% of Partners' Capital	1.09%
[1] Collateral amounted to $144,417,387 on open futures contracts.

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