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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 378,099,028 $ (448,435,312)
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 311,843,294 (67,821,144)
Unrealized (gain) loss on open futures contracts (270,039,300) (141,505,556)
(Increase) decrease in dividends receivable (166,865) (425)
(Increase) decrease in directors' fees and insurance receivable (15,931) 0
(Increase) decrease in prepaid registration fees (638,599) (807,914)
Increase (decrease) in payable due to Broker 64,960,641 0
Increase (decrease) in General Partner management fees payable (25,434) 575,652
Increase (decrease) in professional fees payable 5,887 (311,988)
Increase (decrease) in brokerage commissions payable (25,000) 124,300
Increase (decrease) in directors' fees and insurance payable (42,863) (7,914)
Increase (decrease) in license fees payable 35,611 61,940
Net cash provided by (used in) operating activities 483,990,469 (658,128,361)
Cash Flows from Financing Activities:    
Addition of partnership shares 3,046,756,478 6,885,340,537
Redemption of partnership shares (3,148,075,673) (5,228,046,309)
Net cash provided by (used in) financing activities (101,319,195) 1,657,294,228
Net Increase (Decrease) in Cash and Cash Equivalents 382,671,274 999,165,867
Cash and Cash Equivalents, beginning of period 2,725,177,054 1,139,071,536
Cash and Cash Equivalents, end of period $ 3,107,848,328 $ 2,138,237,403