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Schedule of Investments | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Value/ Unrealized Gain (Loss) on Open Commodity Contracts |  | $ (194,392,958) | $ 117,780,350
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL February 2019 contracts, expiring January 2019 [Member] |  |  |
Notional Amount | [1] | $ 1,662,952,358 |
Number of Contracts | [1] | 32,340 |
Value/ Unrealized Gain (Loss) on Open Commodity Contracts | [1] | $ (194,392,958) |
% of Partners' Capital | [1] | (13.24%) |
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL February 2018 contracts, expiring January 2018 [Member] |  |  |
Notional Amount | [2] |  | $ 1,901,697,730
Number of Contracts | [2] |  | 33,424
Value/ Unrealized Gain (Loss) on Open Commodity Contracts | [2] |  | $ 117,780,350
% of Partners' Capital | [2] |  | 5.83%
Cash Equivalents [Member] |  |  |
Market Value |  | $ 1,334,416,220 | $ 1,989,077,878
% of Partners' Capital |  | 90.87% | 98.49%
Cash Equivalents [Member] | United States Treasury Obligations [Member] |  |  |
Market Value |  | $ 1,282,416,220 | $ 1,839,077,878
% of Partners' Capital |  | 87.33% | 91.05%
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 |  | $ 59,968,800 |
% of Partners' Capital |  | 4.08% |
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 |  | $ 49,953,111 |
% of Partners' Capital |  | 3.40% |
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 |  | $ 69,904,965 |
% of Partners' Capital |  | 4.76% |
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 |  | $ 59,892,250 |
% of Partners' Capital |  | 4.08% |
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 |  | $ 49,888,229 |
% of Partners' Capital |  | 3.40% |
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 |  | $ 59,840,867 |
% of Partners' Capital |  | 4.07% |
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 |  | $ 49,845,583 |
% of Partners' Capital |  | 3.39% |
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 |  | $ 49,821,569 |
% of Partners' Capital |  | 3.39% |
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 |  | $ 49,787,396 |
% of Partners' Capital |  | 3.39% |
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 |  | $ 49,774,500 |
% of Partners' Capital |  | 3.39% |
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 |  | $ 49,747,639 |
% of Partners' Capital |  | 3.39% |
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 |  | $ 49,724,084 |
% of Partners' Capital |  | 3.39% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.37%, 4/04/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,697,104 |
% of Partners' Capital |  | 3.38% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.41%, 4/11/2019 [Member] |  |  |
Principal Amount |  | $ 60,000,000 |
Market Value |  | $ 59,602,500 |
% of Partners' Capital |  | 4.06% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.42%, 4/18/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,644,076 |
% of Partners' Capital |  | 3.38% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.43%, 4/25/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,620,000 |
% of Partners' Capital |  | 3.38% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.46%, 5/02/2019 [Member] |  |  |
Principal Amount |  | $ 60,000,000 |
Market Value |  | $ 59,510,958 |
% of Partners' Capital |  | 4.05% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.47%, 5/09/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,567,111 |
% of Partners' Capital |  | 3.38% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.48%, 05/16/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,540,625 |
% of Partners' Capital |  | 3.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.50%, 5/23/2019 [Member |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,513,847 |
% of Partners' Capital |  | 3.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.49%, 5/30/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,491,434 |
% of Partners' Capital |  | 3.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.51%, 6/06/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,463,750 |
% of Partners' Capital |  | 3.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.51%, 6/13/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,438,555 |
% of Partners' Capital |  | 3.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.49%, 6/20/2019 [Member] |  |  |
Principal Amount |  | $ 50,000,000 |
Market Value |  | $ 49,419,167 |
% of Partners' Capital |  | 3.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.49%, 6/27/2019 [Member] |  |  |
Principal Amount |  | $ 20,000,000 |
Market Value |  | $ 19,758,100 |
% of Partners' Capital |  | 1.35% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.12%, 1/04/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,993,031
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.11%, 1/11/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,976,979
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.10%, 1/18/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,961,396
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.12%, 1/25/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,944,250
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.12%, 2/01/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,927,990
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.13%, 2/08/2018 [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 49,940,625
% of Partners' Capital |  |  | 2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.12%, 2/15/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,895,937
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.10%, 2/22/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,881,917
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.09%, 3/01/2018 [Member] |  |  |
Principal Amount |  |  | $ 100,000,000
Market Value |  |  | $ 99,822,180
% of Partners' Capital |  |  | 4.94%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.14%, 3/08/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,844,281
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.14%, 3/15/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,828,146
% of Partners' Capital |  |  | 3.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.16%, 3/22/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,808,333
% of Partners' Capital |  |  | 3.70%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.17%, 3/29/2018 [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 49,859,833
% of Partners' Capital |  |  | 2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.19%, 4/05/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,767,938
% of Partners' Capital |  |  | 3.70%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.22%, 4/12/2018 [Member] |  |  |
Principal Amount |  |  | $ 60,000,000
Market Value |  |  | $ 59,795,475
% of Partners' Capital |  |  | 2.96%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.45%, 4/19/2018 [Member] |  |  |
Principal Amount |  |  | $ 70,000,000
Market Value |  |  | $ 69,744,325
% of Partners' Capital |  |  | 3.45%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.25%, 4/26/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,702,917
% of Partners' Capital |  |  | 3.70%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.27%, 5/03/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,679,750
% of Partners' Capital |  |  | 3.70%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.32%, 5/10/2018 [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 49,765,292
% of Partners' Capital |  |  | 2.46%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.37%, 5/17/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,615,375
% of Partners' Capital |  |  | 3.70%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.43%, 5/24/2018 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,578,448
% of Partners' Capital |  |  | 3.69%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.43%, 5/31/2018 [Member] |  |  |
Principal Amount |  |  | $ 70,000,000
Market Value |  |  | $ 69,585,833
% of Partners' Capital |  |  | 3.45%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.45%, 6/07/2018 [Member] |  |  |
Principal Amount |  |  | $ 70,000,000
Market Value |  |  | $ 69,560,400
% of Partners' Capital |  |  | 3.44%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.46%, 6/14/2018 [Member] |  |  |
Principal Amount |  |  | $ 60,000,000
Market Value |  |  | $ 59,605,033
% of Partners' Capital |  |  | 2.95%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.49%, 6/21/2018 [Member] |  |  |
Principal Amount |  |  | $ 70,000,000
Market Value |  |  | $ 69,507,900
% of Partners' Capital |  |  | 3.44%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.50%, 6/28/2018 [Member] |  |  |
Principal Amount |  |  | $ 70,000,000
Market Value |  |  | $ 69,484,294
% of Partners' Capital |  |  | 3.44%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] |  |  |
Market Value |  | $ 52,000,000 | $ 150,000,000
% of Partners' Capital |  | 3.54% | 7.44%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 50,000,000
% of Partners' Capital |  |  | 2.48%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] |  |  |
Principal Amount |  | $ 17,000,000 | $ 50,000,000
Market Value |  | $ 17,000,000 | $ 50,000,000
% of Partners' Capital |  | 1.16% | 2.48%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member] |  |  |
Principal Amount |  | $ 35,000,000 | $ 50,000,000
Market Value |  | $ 35,000,000 | $ 50,000,000
% of Partners' Capital |  | 2.38% | 2.48%
[1] | Collateral amounted to $433,776,173 on open futures contracts.
[2] | Collateral amounted to $144,626,242 on open futures contracts.

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