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Condensed Schedule of Investments | Dec. 31, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract
--- | --- | ---
Value/ Unrealized Gain (Loss) on Open Commodity Contracts |  | $ 117,780,350 | $ 111,290,560
United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member] |  |  |
Principal Amount |  | 50,000,000 | 300,000,000
Market Value |  | $ 50,000,000 | $ 300,000,000
% of Partners' Capital |  | 2.48% | 9.67%
United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] |  |  |
Principal Amount |  | $ 50,000,000 | $ 200,000,001
Market Value |  | $ 50,000,000 | $ 200,000,001
% of Partners' Capital |  | 2.48% | 6.45%
United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member] |  |  |
Principal Amount |  | $ 50,000,000 | $ 198,000,000
Market Value |  | $ 50,000,000 | $ 198,000,000
% of Partners' Capital |  | 2.48% | 6.39%
United States [Member] | Money Market Funds [Member] | Wells Fargo Government Money Market Fund - Class I [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 50,000,000
% of Partners' Capital |  |  | 1.61%
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL February 2018 contracts, expiring January 2018 |  |  |
Notional Amount | [1] | $ 1,901,697,730 |
Number of Contracts | Contract | [1] | 33,424 |
Value/ Unrealized Gain (Loss) on Open Commodity Contracts | [1] | $ 117,780,350 |
% of Partners' Capital | [1] | 5.83% |
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL February 2017 contracts, expiring January 2017 [Member] |  |  |
Notional Amount | [2] |  | $ 2,990,717,120
Number of Contracts | Contract | [2] |  | 57,744
Value/ Unrealized Gain (Loss) on Open Commodity Contracts | [2] |  | $ 111,290,560
% of Partners' Capital | [2] |  | 3.59%
Cash Equivalents [Member] | United States [Member] |  |  |
Market Value |  | $ 1,989,077,878 | $ 2,770,212,015
% of Partners' Capital |  | 98.49% | 89.31%
Cash Equivalents [Member] | United States [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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 [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] | U.S. Treasury Bills, 0.34%, 1/05/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,997,167
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.38%, 1/12/2017 [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 49,994,194
% of Partners' Capital |  |  | 1.61%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.43%, 1/19/2017 [Member] |  |  |
Principal Amount |  |  | $ 50,000,000
Market Value |  |  | $ 49,989,375
% of Partners' Capital |  |  | 1.61%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.36%, 1/26/2017 [Member] |  |  |
Principal Amount |  |  | $ 100,000,000
Market Value |  |  | $ 99,975,000
% of Partners' Capital |  |  | 3.22%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.40%, 2/02/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,973,333
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.42%, 2/09/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,965,875
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.45%, 2/16/2017 [Member] |  |  |
Principal Amount |  |  | $ 100,000,000
Market Value |  |  | $ 99,942,500
% of Partners' Capital |  |  | 3.22%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.45%, 2/23/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,950,865
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.45%, 3/02/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,943,750
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.47%, 3/09/2017 [Member] |  |  |
Principal Amount |  |  | $ 100,000,000
Market Value |  |  | $ 99,912,528
% of Partners' Capital |  |  | 3.22%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.50%, 3/16/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,922,531
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.45%, 3/23/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,924,906
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.43%, 3/30/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,921,167
% of Partners' Capital |  |  | 2.42%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.46%, 4/06/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,909,948
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.47%, 4/13/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,900,125
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.46%, 4/20/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,896,677
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.47%, 4/27/2017 [Member] |  |  |
Principal Amount |  |  | $ 100,000,000
Market Value |  |  | $ 99,850,167
% of Partners' Capital |  |  | 3.22%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.52%, 5/04/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,866,750
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.55%, 5/11/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,852,396
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.60%, 5/18/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,830,177
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.61%, 5/25/2017 [Member] |  |  |
Principal Amount |  |  | $ 100,000,000
Market Value |  |  | $ 99,757,000
% of Partners' Capital |  |  | 3.22%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.60%, 6/01/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,812,823
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.62%, 6/08/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,797,562
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.65%, 6/15/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,778,282
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.64%, 6/22/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,770,666
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills, 0.60%, 6/29/2017 [Member] |  |  |
Principal Amount |  |  | $ 75,000,000
Market Value |  |  | $ 74,776,250
% of Partners' Capital |  |  | 2.41%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] |  |  |
Market Value |  | $ 1,839,077,878 | $ 2,022,212,014
% of Partners' Capital |  | 91.05% | 65.19%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] |  |  |
Market Value |  | $ 150,000,000 | $ 748,000,001
% of Partners' Capital |  | 7.44% | 24.12%
[1] | Collateral amounted to $144,626,242 on open futures contracts.
[2] | Collateral amounted to $249,864,944 on open futures contracts.

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