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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) $ 50,003,562 $ (152,131,287)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts 35,120,220 56,069,637
(Increase) decrease in dividends receivable 5,866 559
(Increase) decrease in interest receivable 7,247 (25,774)
(Increase) decrease in directors' fees and insurance receivable 0 (1,445)
(Increase) decrease in prepaid registration fees 68,542 (12,112)
(Increase) decrease in ETF transaction fees receivable 2,000 0
Increase (decrease) in payable due to Broker 15,986,912 (44,770,339)
Increase (decrease) in General Partner management fees payable (195,202) (62,879)
Increase (decrease) in professional fees payable (253,479) (17,873)
Increase (decrease) in brokerage commissions payable (12,500) (12,400)
Increase (decrease) in directors' fees and insurance payable 17,208 (5,417)
Increase (decrease) in license fees payable (9,843) (11,594)
Net cash provided by (used in) operating activities 100,740,533 (140,980,924)
Cash Flows from Financing Activities:    
Addition of partnership shares 1,050,763,122 1,211,520,273
Redemption of partnership shares (1,501,863,094) (1,107,715,873)
Net cash provided by (used in) financing activities (451,099,972) 103,804,400
Net Increase (Decrease) in Cash and Cash Equivalents (350,359,439) (37,176,524)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 651,938,294 567,786,082
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period 301,578,855 530,609,558
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 281,621,183 441,727,976
Equity in Trading Accounts:    
Cash and Cash Equivalents 19,957,672 88,881,582
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 301,578,855 $ 530,609,558