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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities:      
Net income (loss) $ 78,972,397 $ 666,552,810 $ (1,288,412,920)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
(Increase) decrease in commodity futures trading account - cash and cash equivalents 105,238,702 301,869,975 (276,673,230)
Unrealized (gain) loss on open futures contracts (6,489,790) (249,798,620) (29,109,870)
(Increase) decrease in dividends receivable 68,612 (214,021) (3,836)
(Increase) decrease in interest receivable (32,182) 0 0
(Increase) decrease in prepaid registration fees 348,425 (550,777) (726,055)
(Increase) decrease in ETF transaction fees receivable 3,000 0 (2,000)
Increase (decrease) in payable due to Broker (53,495,599) 110,778,928 0
Increase (decrease) in General Partner management fees payable (456,590) 77,120 775,792
Increase (decrease) in professional fees payable 229,229 623,632 305,047
Increase (decrease) in brokerage commissions payable (48,000) (25,000) 187,300
Increase (decrease) in directors' fees and insurance payable (4,328) (16,747) 21,083
Increase (decrease) in license fees payable (75,801) 36,323 78,464
Net cash provided by (used in) operating activities 124,258,075 829,333,623 (1,593,560,225)
Cash Flows from Financing Activities:      
Addition of partnership shares 4,138,684,744 4,489,405,734 9,185,457,218
Redemption of partnership shares (5,336,829,913) (5,123,398,604) (6,005,791,475)
Net cash provided by (used in) financing activities (1,198,145,169) (633,992,870) 3,179,665,743
Net Increase (Decrease) in Cash and Cash Equivalents (1,073,887,094) 195,340,753 1,586,105,518
Cash and Cash Equivalents, beginning of year 2,920,517,807 2,725,177,054 1,139,071,536
Cash and Cash Equivalents, end of year $ 1,846,630,713 $ 2,920,517,807 $ 2,725,177,054