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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) $ (511,928,455) $ 462,453,889
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 (203,760,133) (72,869,830)
Unrealized (gain) loss on open futures contracts 117,545,460 33,328,530
(Increase) decrease in dividends receivable (101,732) (177,997)
(Increase) decrease in directors' fees and insurance receivable (46,375) (54,750)
(Increase) decrease in prepaid registration fees 172,781 (726,421)
(Increase) decrease in ETF transaction fees receivable 2,000 (2,000)
Increase (decrease) in payable due to Broker (110,778,928) 0
Increase (decrease) in General Partner management fees payable (277,027) 66,303
Increase (decrease) in professional fees payable (805,874) (629,701)
Increase (decrease) in brokerage commissions payable (48,000) (25,000)
Increase (decrease) in directors' fees and insurance payable (26,116) (42,863)
Increase (decrease) in license fees payable (51,967) 45,779
Net cash provided by (used in) operating activities (710,104,366) 421,365,939
Cash Flows from Financing Activities:    
Addition of partnership shares 2,739,803,719 1,907,604,740
Redemption of partnership shares (2,122,146,969) (2,126,168,594)
Net cash provided by (used in) financing activities 617,656,750 (218,563,854)
Net Increase (Decrease) in Cash and Cash Equivalents (92,447,616) 202,802,085
Cash and Cash Equivalents, beginning of period 2,920,517,807 2,725,177,054
Cash and Cash Equivalents, end of period $ 2,828,070,191 $ 2,927,979,139