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Condensed Statements of Operations - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ 183,289,170	$ (155,270,440)
Change in unrealized gain (loss) on open futures contracts		(15,464,070)	(96,491,490)
Dividend income		283,406	858,889
Interest income	[1]	6,294,976	2,940,939
ETF transaction fees		115,000	69,350
Total income (loss)		174,518,482	(247,892,752)
Expenses
General Partner management fees (Note 3)		2,187,506	3,226,589
Professional fees		508,685	590,480
Brokerage commissions		694,480	1,161,407
Directors' fees and insurance		75,556	90,610
License fees		72,917	107,553
Registration fees		81,464	85,913
Total expenses		3,620,608	5,262,552
Net income (loss)		$ 170,897,874	$ (253,155,304)
Net income (loss) per limited partnership share		$ 1.02	$ (1.09)
Net income (loss) per weighted average limited partnership share		$ 1.09	$ (0.97)
Weighted average limited partnership shares outstanding		156,170,000	261,642,222
[1] Interest income does not exceed paid in kind of 5%.

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Gain (Loss) On Commodity Futures [Abstract]

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