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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash Flows from Operating Activities:    
Net income (loss) $ 228,569,109 $ 61,641,050
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 3,747,258 (10,784,868)
Unrealized (gain) loss on futures contracts (120,444,675) (3,386,840)
(Increase) decrease in dividends receivable (850) 2,895
(Increase) decrease in interest receivable 0 52
(Increase) decrease in directors' fees and insurance receivable (12,101) (27,016)
(Increase) decrease in prepaid registration fees (889,772) 0
(Increase) decrease in ETF transaction fees receivable (2,000) 4,000
Increase (decrease) in General Partner management fees payable 472,838 (48,374)
Increase (decrease) in professional fees payable (531,285) (486,297)
Increase (decrease) in brokerage commissions payable 100,300 (4,000)
Increase (decrease) in directors' fees and insurance payable (21,780) (20,881)
Increase (decrease) in license fees payable 63,561 (8,509)
Increase (decrease) in registration fees payable 0 (153)
Net cash provided by (used in) operating activities 111,050,603 46,881,059
Cash Flows from Financing Activities:    
Addition of partnership shares 4,381,467,351 2,462,085,762
Redemption of partnership shares (3,544,898,325) (2,475,475,959)
Net cash provided by (used in) financing activities 836,569,026 (13,390,197)
Net Increase (Decrease) in Cash and Cash Equivalents 947,619,629 33,490,862
Cash and Cash Equivalents, beginning of period 1,139,071,536 570,875,786
Cash and Cash Equivalents, end of period $ 2,086,691,165 $ 604,366,648