Schedule of Investments	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ 37,520,567	$ (194,392,958)
Open Futures Contracts- Long \| United States Contracts \| NYMEX WTI Crude Oil Futures CL February 2020 contracts, expiring January 2020
Notional Amount	$ 1,133,488,110
Number of Contracts	19,178
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ 37,520,567
% of Partners' Capital	3.20%
Open Futures Contracts- Long \| United States Contracts \| NYMEX WTI Crude Oil Futures CL February 2019 contracts, expiring January 2019
Notional Amount		$ 1,662,952,358
Number of Contracts		32,340
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (194,392,958)
% of Partners' Capital		(13.24%)
Cash Equivalents
Market Value	$ 1,175,542,347	$ 1,334,416,220
% of Partners' Capital	100.39%	90.87%
Cash Equivalents \| United States Money Market Funds
Market Value	$ 20,000,000	$ 52,000,000
% of Partners' Capital	1.71%	3.54%
Cash Equivalents \| United States Money Market Funds \| Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount		$ 17,000,000
Market Value		$ 17,000,000
% of Partners' Capital		1.16%
Cash Equivalents \| United States Money Market Funds \| Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount		$ 35,000,000
Market Value		$ 35,000,000
% of Partners' Capital		2.38%
Cash Equivalents \| United States Money Market Funds \| Fidelity Investments Money Market Funds - Government Portfolio
Principal Amount	$ 20,000,000
Cash Equivalents \| United States Treasury Obligations
Market Value	$ 1,155,542,347	$ 1,282,416,220
% of Partners' Capital	98.68%	87.33%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.05%, 1/02/2020
Principal Amount	$ 25,000,000
Market Value	$ 24,998,594
% of Partners' Capital	2.13%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.03%, 1/09/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,977,667
% of Partners' Capital	4.27%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.02%, 1/30/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,919,525
% of Partners' Capital	4.27%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.04%, 1/23/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,938,369
% of Partners' Capital	4.26%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.01%, 1/16/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,958,646
% of Partners' Capital	4.27%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.89%, 2/06/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,906,251
% of Partners' Capital	4.26%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.87%, 2/13/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,889,215
% of Partners' Capital	4.26%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.85%, 2/20/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,872,569
% of Partners' Capital	4.26%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.85%, 2/27/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,855,126
% of Partners' Capital	4.26%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.83%, 3/05/2020
Principal Amount	$ 100,000,000
Market Value	$ 99,677,067
% of Partners' Capital	8.51%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.84%, 3/19/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,802,833
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.88%, 3/26/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,780,417
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.70%, 4/02/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,784,056
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.64%, 4/09/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,775,875
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.60%, 4/16/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,765,917
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.60%, 4/23/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,750,458
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.59%, 4/30/2020
Principal Amount	$ 50,000,000
Market Value	$ 49,737,500
% of Partners' Capital	4.25%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.54%, 5/07/2020
Principal Amount	$ 45,000,000
Market Value	$ 44,757,906
% of Partners' Capital	3.82%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.55%, 5/14/2020
Principal Amount	$ 30,000,000
Market Value	$ 29,828,033
% of Partners' Capital	2.55%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.55%, 5/21/2020
Principal Amount	$ 30,000,000
Market Value	$ 29,819,638
% of Partners' Capital	2.55%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.58%, 5/28/2020
Principal Amount	$ 30,000,000
Market Value	$ 29,806,367
% of Partners' Capital	2.55%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.53%, 6/04/2020
Principal Amount	$ 40,000,000
Market Value	$ 39,738,222
% of Partners' Capital	3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.53%, 6/11/2020
Principal Amount	$ 30,000,000
Market Value	$ 29,794,463
% of Partners' Capital	2.54%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.54%, 6/18/2020
Principal Amount	$ 40,000,000
Market Value	$ 39,712,700
% of Partners' Capital	3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 1.57%, 6/25/2020
Principal Amount	$ 40,000,000
Market Value	$ 39,694,933
% of Partners' Capital	3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.10%, 1/10/2019
Principal Amount		$ 60,000,000
Market Value		$ 59,968,800
% of Partners' Capital		4.08%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.13%, 1/17/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,953,111
% of Partners' Capital		3.40%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.15%, 1/24/2019
Principal Amount		$ 70,000,000
Market Value		$ 69,904,965
% of Partners' Capital		4.76%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.18%, 1/31/2019
Principal Amount		$ 60,000,000
Market Value		$ 59,892,250
% of Partners' Capital		4.08%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.20%, 2/07/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,888,229
% of Partners' Capital		3.40%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.19%, 2/14/2019
Principal Amount		$ 60,000,000
Market Value		$ 59,840,867
% of Partners' Capital		4.07%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.20%, 2/21/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,845,583
% of Partners' Capital		3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.24%, 2/28/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,821,569
% of Partners' Capital		3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.38%, 3/07/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,787,396
% of Partners' Capital		3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.28%, 3/14/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,774,500
% of Partners' Capital		3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.33%, 3/21/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,747,639
% of Partners' Capital		3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.34%, 3/28/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,724,084
% of Partners' Capital		3.39%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.37%, 4/04/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,697,104
% of Partners' Capital		3.38%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.41%, 4/11/2019
Principal Amount		$ 60,000,000
Market Value		$ 59,602,500
% of Partners' Capital		4.06%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.42%, 4/18/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,644,076
% of Partners' Capital		3.38%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.43%, 4/25/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,620,000
% of Partners' Capital		3.38%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.46%, 5/02/2019
Principal Amount		$ 60,000,000
Market Value		$ 59,510,958
% of Partners' Capital		4.05%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.47%, 5/09/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,567,111
% of Partners' Capital		3.38%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.48%, 5/16/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,540,625
% of Partners' Capital		3.37%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.50%, 5/23/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,513,847
% of Partners' Capital		3.37%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.49%, 5/30/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,491,434
% of Partners' Capital		3.37%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.51%, 6/06/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,463,750
% of Partners' Capital		3.37%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.51%, 6/13/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,438,555
% of Partners' Capital		3.37%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.49%, 6/20/2019
Principal Amount		$ 50,000,000
Market Value		$ 49,419,167
% of Partners' Capital		3.37%
Cash Equivalents \| United States Treasury Obligations \| U.S. Treasury Bills, 2.49%, 6/27/2019
Principal Amount		$ 20,000,000
Market Value		$ 19,758,100
% of Partners' Capital		1.35%