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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash Flows from Operating Activities:    
Net income (loss) $ (94,878,439) $ (115,057,128)
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 (9,547) (54,843,593)
Unrealized (gain) loss on open futures contracts 15,295,497 106,553,296
(Increase) decrease in dividends receivable 11,943 (5,688)
(Increase) decrease in directors' fees and insurance receivable (14,015) (14,892)
(Increase) decrease in prepaid registration fees 82,458 100,645
(Increase) decrease in ETF transaction fees receivable 0 2,000
Increase (decrease) in payable due to Broker (24,293,941) (40,863,950)
Increase (decrease) in General Partner management fees payable (55,251) 12,850
Increase (decrease) in professional fees payable (256,191) (601,171)
Increase (decrease) in brokerage commissions payable (12,400) 0
Increase (decrease) in directors' fees and insurance payable (5,417) 0
Increase (decrease) in license fees payable (10,859) (5,937)
Net cash provided by (used in) operating activities (104,146,162) (104,723,568)
Cash Flows from Financing Activities:    
Addition of partnership shares 554,200,456 185,124,024
Redemption of partnership shares (535,634,599) (84,677,241)
Net cash provided by (used in) financing activities 18,565,857 100,446,783
Net Increase (Decrease) in Cash and Cash Equivalents (85,580,305) (4,276,785)
Cash and Cash Equivalents, beginning of period 522,819,857 453,830,484
Cash and Cash Equivalents, end of period $ 437,239,552 $ 449,553,699