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Schedule of Investments
Dec. 31, 2016
USD ($)
Contract
Dec. 31, 2015
USD ($)
Contract
Unrealized Gain (Loss) on Open Commodity Contracts $ 111,290,560 $ (138,508,060)
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL November 2016 contracts, expiring January 2016 [Member]    
Number of Contracts | Contract 57,744 [1] 84,290 [2]
Unrealized Gain (Loss) on Open Commodity Contracts $ 111,290,560 [1] $ (138,508,060) [2]
% of Partners' Capital 3.59% [1] (4.44%) [2]
Cash Equivalent [Member]    
Market Value $ 2,770,212,015 $ 2,468,495,664
% of Partners' Capital 89.31% 79.07%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.10%, 01/07/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,999,208
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.11%, 1/14/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,998,059
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.13%, 1/21/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,996,528
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.15%, 1/28/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,991,844
% of Partners' Capital   2.41%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.19%, 2/04/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,986,896
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.22%, 2/11/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,981,635
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.20%, 2/18/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,980,000
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.20%, 2/25/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,977,656
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.23%, 3/03/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,970,615
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.26%, 3/10/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,963,344
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.24%, 3/17/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,974,667
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.09%, 3/24/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,985,302
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 3/31/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,987,812
% of Partners' Capital   2.41%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 4/07/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,985,854
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 4/14/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,985,917
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.11%, 4/21/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,974,563
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.21%, 4/28/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,948,375
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.26%, 5/05/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,954,861
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.33%, 5/12/2016 [Member]    
Principal Amount   $ 70,000,000
Market Value   $ 69,915,300
% of Partners' Capital   2.24%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.31%, 5/19/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,910,229
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.35%, 5/26/2016 [Member]    
Principal Amount   $ 80,000,000
Market Value   $ 79,886,445
% of Partners' Capital   2.56%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.43%, 6/02/2016 [Member]    
Principal Amount   $ 75,000,000
Market Value   $ 74,864,531
% of Partners' Capital   2.40%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.52%, 6/09/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,884,445
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.48%, 6/16/2016 [Member]    
Principal Amount   $ 50,000,000
Market Value   $ 49,888,667
% of Partners' Capital   1.60%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.46%, 6/23/2016 [Member]    
Principal Amount   $ 70,000,000
Market Value   $ 69,846,058
% of Partners' Capital   2.24%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.00%, 6/30/2016 [Member]    
Principal Amount   $ 150,000,000
Market Value   $ 149,656,853
% of Partners' Capital   4.79%
Cash Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [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 Equivalent [Member] | United States [Member] | US Treasury Securities [Member]    
Market Value $ 2,022,212,014 $ 1,843,495,664
% of Partners' Capital 65.19% 59.05%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member]    
Market Value $ 748,000,001 $ 625,000,000
% of Partners' Capital 24.12% 20.02%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount $ 300,000,000 $ 200,000,000
Market Value $ 300,000,000 $ 200,000,000
% of Partners' Capital 9.67% 6.41%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 200,000,001 $ 225,000,000
Market Value $ 200,000,001 $ 225,000,000
% of Partners' Capital 6.45% 7.20%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund Government Portfolio [Member]    
Principal Amount $ 198,000,000 $ 200,000,000
Market Value $ 198,000,000 $ 200,000,000
% of Partners' Capital 6.39% 6.41%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member]    
Principal Amount $ 50,000,000  
Market Value $ 50,000,000  
% of Partners' Capital 1.61%  
[1] Collateral amounted to $249,864,944 on open futures contracts.
[2] Collateral amounted to $551,734,919 on open futures contracts.