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Condensed Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)		$ (1,905,181,579)	$ 473,455,704	$ (291,274,645)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Change in unrealized (gain) loss on open commodity futures contracts		(363,923,391)	(231,913,525)	312,173,308
(Increase) decrease in dividends receivable		2,200	138,151	10,305
(Increase) decrease in interest receivable		(132,758)	831	3,152
(Increase) decrease in prepaid insurance	[1]	817	(7,571)	(5,114)
(Increase) decrease in prepaid registration fees		(1,185,800)	504,876	349,290
Increase (decrease) in payable due to Broker		14,846,706	8,820,649	(57,283,329)
Increase (decrease) in General Partner management fees payable		939,671	(116,084)	(215,644)
Increase (decrease) in professional fees payable		449,177	(287,285)	(317,442)
Increase (decrease) in brokerage commissions payable		233,897		(98,000)
Increase (decrease) in directors' fees payable	[1]	8,661	441	(5,425)
Increase (decrease) in license fees payable		129,894	(13,869)	(21,487)
Net cash provided by (used in) operating activities		(2,253,812,505)	250,582,318	(36,685,031)
Cash Flows from Financing Activities:
Addition of partnership shares		8,030,979,653	3,218,764,872	3,988,747,637
Redemption of partnership shares		(3,644,174,420)	(3,950,037,755)	(4,286,383,585)
Net cash provided by (used in) financing activities		4,386,805,233	(731,272,883)	(297,635,948)
Net Increase (Decrease) in Cash and Cash Equivalents		2,132,992,728	(480,690,565)	(334,320,979)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		1,176,245,411	1,656,935,976	1,991,256,955
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		$ 3,309,238,139	$ 1,176,245,411	$ 1,656,935,976
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.

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