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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (140,098,159) $ 36,596,494
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 (3,155,881) (78,556,895)
Unrealized (gain) loss on open futures contracts 32,144,157 47,814,042
(Increase) decrease in dividends receivable 2,602 (8,073)
(Increase) decrease in directors' fees and insurance receivable (8,901) 17,569
(Increase) decrease in prepaid registration fees (53,749) 201,290
(Increase) decrease in ETF transaction fees receivable 2,000 0
Increase (decrease) in payable due to Broker (44,770,339) (40,863,950)
Increase (decrease) in General Partner management fees payable (85,594) 30,477
Increase (decrease) in professional fees payable (163,651) (832,687)
Increase (decrease) in brokerage commissions payable (12,400) 1,450
Increase (decrease) in directors' fees and insurance payable (5,417) 0
Increase (decrease) in license fees payable (12,573) (3,603)
Net cash provided by (used in) operating activities (156,217,905) (35,603,886)
Cash Flows from Financing Activities:    
Addition of partnership shares 926,956,014 234,539,401
Redemption of partnership shares (899,185,668) (216,547,252)
Net cash provided by (used in) financing activities 27,770,346 17,992,149
Net Increase (Decrease) in Cash and Cash Equivalents (128,447,559) (17,611,737)
Cash and Cash Equivalents, beginning of period 522,819,857 453,830,484
Cash and Cash Equivalents, end of period $ 394,372,298 $ 436,218,747