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Condensed Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed commodity futures contracts $ (2,251,576,260) $ 220,179,889 $ 1,603,334
Change in unrealized gain (loss) on open commodity futures contracts 363,923,391 231,913,525 (312,173,308)
Realized gain (loss) on short-term investments   11,258 (3,070)
Dividend income 1,949,571 2,957,196 2,213,034
Interest income [1] 8,528,581 29,461,116 29,889,589
ETF transaction fees 289,546 312,000 358,000
Total Income (Loss) (1,876,885,171) 484,834,984 (278,112,421)
Expenses      
General Partner management fees (Note 3) 15,388,313 6,461,273 8,147,165
Professional fees 2,694,975 1,440,997 1,539,401
Brokerage commissions 6,104,865 2,423,017 2,538,611
Directors' fees and insurance 391,372 333,741 316,185
License fees 512,944 215,376 271,572
Registration fees 3,203,939 504,876 349,290
Total Expenses 28,296,408 11,379,280 13,162,224
Net Income (Loss) $ (1,905,181,579) $ 473,455,704 $ (291,274,645)
Net Income (Loss) per limited partner share [2] $ (69.20) $ 25.59 $ (19.95)
Net Income (Loss) per weighted average limited partner share [2] $ (16.61) $ 31.24 $ (17.01)
Weighted average limited partner shares outstanding [2] 114,667,411 15,155,959 17,125,822
[1] Interest income does not exceed paid in kind of 5%.
[2] On April 28, 2020, there was a 1-for-8 reverse share split. The Statements of Operations have been adjusted for the periods shown to reflect the 1-for-8 reverse share split on a retroactive basis.