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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) $ 11,097,621 $ (94,878,439)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts 56,078,080 15,295,497
(Increase) decrease in dividends receivable (7,536) 11,943
(Increase) decrease in interest receivable 6,859 0
(Increase) decrease in directors' fees and insurance receivable 0 (14,015)
(Increase) decrease in prepaid registration fees 39,269 82,458
(Increase) decrease in ETF transaction fees receivable 1,000 0
Increase (decrease) in payable due to Broker 0 (24,293,941)
Increase (decrease) in General Partner management fees payable (154,484) (55,251)
Increase (decrease) in professional fees payable (172,763) (256,191)
Increase (decrease) in brokerage commissions payable (12,500) (12,400)
Increase (decrease) in directors' fees and insurance payable 2,337 (5,417)
Increase (decrease) in license fees payable (5,578) (10,859)
Net cash provided by (used in) operating activities 66,872,305 (104,136,615)
Cash Flows from Financing Activities:    
Addition of partnership shares 463,303,459 554,200,456
Redemption of partnership shares (813,825,999) (535,634,599)
Net cash provided by (used in) financing activities (350,522,540) 18,565,857
Net Increase (Decrease) in Cash and Cash Equivalents (283,650,235) (85,570,758)
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 368,288,059 482,215,324
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 303,769,409 437,239,552
Equity in Trading Accounts:    
Cash and Cash Equivalents 64,518,650 44,975,772
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 368,288,059 $ 482,215,324