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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 431,308,189 $ (1,300,519,431) $ (314,354,470)
Change in unrealized gain (loss) on open futures contracts 249,798,620 29,109,870 (170,342,900)
Realized gain (loss) on short-term investments 14,302 (1,458) 0
Dividend income 2,090,136 75,426 63,583
Interest income 8,864,931 1,692,164 182,708
ETF transaction fees 343,000 348,000 276,000
Total income (loss) 692,419,178 (1,269,295,429) (484,175,079)
Expenses      
General Partner management fees (Note 3) 15,146,837 11,638,694 3,197,210
Professional fees 2,626,030 1,345,741 622,903
Brokerage commissions 6,875,314 5,196,820 988,505
Directors' fees and insurance 373,311 298,255 181,613
License fees 504,895 387,957 106,574
Registration fees 339,981 250,024 1,350
Total expenses 25,866,368 19,117,491 5,098,155
Net income (loss) $ 666,552,810 $ (1,288,412,920) $ (489,273,234)
Net income (loss) per limited partnership share (in dollars per share) $ 0.69 $ (9.13) $ (15.08)
Net income (loss) per weighted average limited partnership share (in dollars per share) $ 2.07 $ (7.93) $ (22.27)
Weighted average limited partnership shares outstanding (in shares) 322,665,574 162,412,877 21,970,685