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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities:    
Net income (loss) $ 170,897,874 $ (253,155,304)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts 15,464,070 96,491,490
(Increase) decrease in dividends receivable 65,444 (55,667)
(Increase) decrease in interest receivable (43,893) 0
(Increase) decrease in directors' fees and insurance receivable 0 (82,126)
(Increase) decrease in prepaid registration fees 81,465 85,913
(Increase) decrease in ETF transaction fees receivable 0 1,650
Increase (decrease) in payable due to Broker (18,781,820) (110,778,928)
Increase (decrease) in General Partner management fees payable (215,267) (186,147)
Increase (decrease) in professional fees payable (209,044) (731,350)
Increase (decrease) in brokerage commissions payable (50,000) (48,000)
Increase (decrease) in directors' fees and insurance payable 25,899 (26,116)
Increase (decrease) in license fees payable (10,176) (53,701)
Net cash provided by (used in) operating activities 167,224,552 (268,538,286)
Cash Flows from Financing Activities:    
Addition of partnership shares 1,082,884,417 1,084,753,021
Redemption of partnership shares (1,502,559,797) (999,933,484)
Net cash provided by (used in) financing activities (419,675,380) 84,819,537
Net Increase (Decrease) in Cash and Cash Equivalents (252,450,828) (183,718,749)
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 1,738,806,127 2,986,664,002
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 1,594,388,740 2,781,662,080
Equity in Trading Accounts:    
Cash and Cash Equivalents 144,417,387 205,001,922
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 1,738,806,127 $ 2,986,664,002