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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 462,453,889 $ 228,569,109
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 (72,869,830) 3,747,258
Unrealized (gain) loss on open futures contracts 33,328,530 (120,444,675)
(Increase) decrease in dividends receivable (177,997) (850)
(Increase) decrease in directors' fees and insurance receivable (54,750) (12,101)
(Increase) decrease in prepaid registration fees (726,421) (889,772)
(Increase) decrease in ETF transaction fees receivable (2,000) (2,000)
Increase (decrease) in General Partner management fees payable 66,303 472,838
Increase (decrease) in professional fees payable (629,701) (531,285)
Increase (decrease) in brokerage commissions payable (25,000) 100,300
Increase (decrease) in directors' fees and insurance payable (42,863) (21,780)
Increase (decrease) in license fees payable 45,779 63,561
Net cash provided by (used in) operating activities 421,365,939 111,050,603
Cash Flows from Financing Activities:    
Addition of partnership shares 1,907,604,740 4,381,467,351
Redemption of partnership shares (2,126,168,594) (3,544,898,325)
Net cash provided by (used in) financing activities (218,563,854) 836,569,026
Net Increase (Decrease) in Cash and Cash Equivalents 202,802,085 947,619,629
Cash and Cash Equivalents, beginning of period 2,725,177,054 1,139,071,536
Cash and Cash Equivalents, end of period $ 2,927,979,139 $ 2,086,691,165