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Condensed Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 472,609,980	$ (246,118,574)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(8,329,350)	(11,252,100)
(Increase) decrease in dividends receivable	(32,925)	(42,364)
(Increase) decrease in interest receivable	(6,326)	(58,562)
(Increase) decrease in directors' fees and insurance receivable	0	(11,035)
(Increase) decrease in prepaid registration fees	93,327	260,603
(Increase) decrease in ETF transaction fees receivable	1,000	3,000
Increase (decrease) in payable due to Broker	(57,283,329)	(57,659,793)
Increase (decrease) in General Partner management fees payable	(309,357)	(350,117)
Increase (decrease) in professional fees payable	(463,115)	(674,717)
Increase (decrease) in brokerage commissions payable	(50,000)	(48,000)
Increase (decrease) in directors' fees and insurance payable	89,218	(26,116)
Increase (decrease) in license fees payable	(17,286)	(61,261)
Net cash provided by (used in) operating activities	406,301,837	(316,039,036)
Cash Flows from Financing Activities:
Addition of partnership shares	2,587,435,194	3,448,660,597
Redemption of partnership shares	(3,361,478,783)	(4,096,107,833)
Net cash provided by (used in) financing activities	(774,043,589)	(647,447,236)
Net Increase (Decrease) in Cash and Cash Equivalents	(367,741,752)	(963,486,272)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period	1,991,256,955	3,170,382,751
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period	1,623,515,203	2,206,896,479
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	1,488,417,608	2,052,310,579
Equity in Trading Accounts:
Cash and Cash Equivalents	135,097,595	154,585,900
Total Cash, Cash Equivalents and Equity in Trading Accounts	$ 1,623,515,203	$ 2,206,896,479

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