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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 97,326,744 $ 120,333,820 $ 166,752,646 $ 451,011,820
Change in unrealized gain (loss) on open futures contracts (185,598,630) (77,520,980) 127,712,218 8,329,350
Realized gain (loss) on short-term investments 7,667   7,667  
Dividend income 219,697 723,714 2,887,915 1,494,267
Interest income [1] 7,510,292 7,988,050 23,357,509 21,631,092
ETF transaction fees 93,000 77,000 247,000 273,000
Total income (loss) (80,441,230) 51,601,604 320,964,955 482,739,529
Expenses        
General Partner management fees (Note 3) 1,550,198 1,984,921 5,020,150 6,293,684
Professional fees 317,592 409,589 1,123,411 1,379,811
Brokerage commissions 616,021 570,108 1,895,834 1,916,737
Directors' fees and insurance 89,972 80,559 242,748 236,202
License fees 51,673 66,164 167,338 209,789
Registration fees 151,791 5,963 429,819 93,326
Total expenses 2,777,247 3,117,304 8,879,300 10,129,549
Net income (loss) $ (83,218,477) $ 48,484,300 $ 312,085,655 $ 472,609,980
Net income (loss) per limited partnership share $ (0.85) $ 0.45 $ 1.69 $ 3.39
Net income (loss) per weighted average limited partnership share $ (0.71) $ 0.40 $ 2.48 $ 3.41
Weighted average limited partnership shares outstanding 116,602,174 121,141,304 126,005,128 138,401,832
[1] Interest income does not exceed paid in kind of 5%.