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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) $ (253,155,304) $ (178,972,992)
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 44,863,022 87,777,961
Unrealized (gain) loss on open futures contracts 96,491,490 (41,526,920)
(Increase) decrease in dividends receivable (55,667) (117,419)
(Increase) decrease in directors' fees and insurance receivable (82,126) (90,500)
(Increase) decrease in prepaid registration fees 85,913 (738,729)
(Increase) decrease in ETF transaction fees receivable 1,650 1,000
Increase (decrease) in payable due to Broker (110,778,928) 0
Increase (decrease) in General Partner management fees payable (186,147) 299,439
Increase (decrease) in professional fees payable (731,350) 16,255
Increase (decrease) in brokerage commissions payable (48,000) 33,000
Increase (decrease) in directors' fees and insurance payable (26,116) (42,863)
Increase (decrease) in license fees payable (53,701) 45,613
Net cash provided by (used in) operating activities (223,675,264) (133,316,155)
Cash Flows from Financing Activities:    
Addition of partnership shares 1,084,753,021 1,576,853,032
Redemption of partnership shares (999,933,484) (953,132,046)
Net cash provided by (used in) financing activities 84,819,537 623,720,986
Net Increase (Decrease) in Cash and Cash Equivalents (138,855,727) 490,404,831
Cash and Cash Equivalents, beginning of period 2,920,517,807 2,725,177,054
Cash and Cash Equivalents, end of period $ 2,781,662,080 $ 3,215,581,885