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Condensed Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 312,085,655	$ 472,609,980
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(127,712,218)	(8,329,350)
(Increase) decrease in dividends receivable	83,797	(32,925)
(Increase) decrease in interest receivable	(3,251)	(6,326)
(Increase) decrease in prepaid insurance	(79,410)	92,543
(Increase) decrease in prepaid registration fees	429,819	93,327
(Increase) decrease in ETF transaction fees receivable	0	1,000
Increase (decrease) in payable due to Broker	0	(57,283,329)
Increase (decrease) in General Partner management fees payable	(73,267)	(309,357)
Increase (decrease) in professional fees payable	(601,991)	(463,115)
Increase (decrease) in brokerage commissions payable	0	(50,000)
Increase (decrease) in directors' fees and insurance payable	(11,249)	0
Increase (decrease) in directors' fees payable	43,060	(3,325)
Increase (decrease) in license fees payable	(10,374)	(17,286)
Net cash provided by (used in) operating activities	184,150,571	406,301,837
Cash Flows from Financing Activities:
Addition of partnership shares	2,687,773,054	2,587,435,194
Redemption of partnership shares	(3,033,822,388)	(3,361,478,783)
Net cash provided by (used in) financing activities	(346,049,334)	(774,043,589)
Net Increase (Decrease) in Cash and Cash Equivalents	(161,898,763)	(367,741,752)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period	1,656,935,976	1,991,256,955
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period	$ 1,495,037,213	$ 1,623,515,203

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