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Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 424,125,680	$ (511,928,455)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(85,850,330)	117,545,460
(Increase) decrease in dividends receivable	(85,373)	(101,732)
(Increase) decrease in interest receivable	(20,344)	0
(Increase) decrease in directors' fees and insurance receivable	(51,967)	(46,375)
(Increase) decrease in prepaid registration fees	87,363	172,781
(Increase) decrease in ETF transaction fees receivable	(1,000)	2,000
Increase (decrease) in payable due to Broker	119,207,725	(110,778,928)
Increase (decrease) in General Partner management fees payable	(125,088)	(277,027)
Increase (decrease) in professional fees payable	(761,854)	(805,874)
Increase (decrease) in brokerage commissions payable	(50,000)	(48,000)
Increase (decrease) in directors' fees and insurance payable	(21,788)	(26,116)
Increase (decrease) in license fees payable	(12,185)	(51,967)
Net cash provided by (used in) operating activities	456,440,839	(506,344,233)
Cash Flows from Financing Activities:
Addition of partnership shares	1,820,121,109	2,739,803,719
Redemption of partnership shares	(2,430,016,001)	(2,122,146,969)
Net cash provided by (used in) financing activities	(609,894,892)	617,656,750
Net Increase (Decrease) in Cash and Cash Equivalents	(153,454,053)	111,312,517
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	1,837,802,902	3,281,695,268
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	1,713,363,666	2,828,070,191
Equity in Trading Accounts:
Cash and Cash Equivalents	124,439,236	453,625,077
Total Cash, Cash Equivalents and Equity in Trading Accounts	$ 1,837,802,902	$ 3,281,695,268

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