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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ (178,972,992) $ (276,690,243)
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 87,777,961 (94,332,573)
Unrealized (gain) loss on open futures contracts (41,526,920) (51,633,790)
(Increase) decrease in dividends receivable (117,419) (849)
(Increase) decrease in directors' fees and insurance receivable (90,500) (35,835)
(Increase) decrease in prepaid registration fees (738,729) (970,741)
(Increase) decrease in ETF transaction fees receivable 1,000 (1,000)
Increase (decrease) in General Partner management fees payable 299,439 651,175
Increase (decrease) in professional fees payable 16,255 (510,645)
Increase (decrease) in brokerage commissions payable 33,000 137,822
Increase (decrease) in directors' fees and insurance payable (42,863) (21,780)
Increase (decrease) in license fees payable 45,613 14,290
Net cash provided by (used in) operating activities (133,316,155) (423,394,169)
Cash Flows from Financing Activities:    
Addition of partnership shares 1,576,853,032 3,130,059,912
Redemption of partnership shares (953,132,046) (1,245,416,310)
Net cash provided by (used in) financing activities 623,720,986 1,884,643,602
Net Increase (Decrease) in Cash and Cash Equivalents 490,404,831 1,461,249,433
Cash and Cash Equivalents, beginning of period 2,725,177,054 1,139,071,536
Cash and Cash Equivalents, end of period $ 3,215,581,885 $ 2,600,320,969