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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flows from Operating Activities:      
Net income (loss) $ 666,552,810 $ (1,288,412,920) $ (489,273,234)
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 301,869,975 (276,673,230) (254,254,816)
Unrealized (gain) loss on open futures contracts (249,798,620) (29,109,870) 170,342,900
(Increase) decrease in dividends receivable (214,021) (3,836) 2,875
(Increase) decrease in interest receivable 0 0 52
(Increase) decrease in prepaid registration fees (550,777) (726,055) 0
(Increase) decrease in ETF transaction fees receivable 0 (2,000) 1,000
Increase (decrease) in payable due to Broker 110,778,928 0 0
Increase (decrease) in General Partner management fees payable 77,120 775,792 148,579
Increase (decrease) in professional fees payable 623,632 305,047 (329,999)
Increase (decrease) in brokerage commissions payable (25,000) 187,300 54,000
Increase (decrease) in directors' fees and insurance payable (16,747) 21,083 899
Increase (decrease) in license fees payable 36,323 78,464 4,294
Increase (decrease) in registration fees payable 0 0 (153)
Net cash provided by (used in) operating activities 829,333,623 (1,593,560,225) (573,303,603)
Cash Flows from Financing Activities:      
Addition of partnership shares 4,489,405,734 9,185,457,218 5,182,907,528
Redemption of partnership shares (5,123,398,604) (6,005,791,475) (4,041,408,175)
Net cash provided by (used in) financing activities (633,992,870) 3,179,665,743 1,141,499,353
Net Increase (Decrease) in Cash and Cash Equivalents 195,340,753 1,586,105,518 568,195,750
Cash and Cash Equivalents, beginning of year 2,725,177,054 1,139,071,536 570,875,786
Cash and Cash Equivalents, end of year $ 2,920,517,807 $ 2,725,177,054 $ 1,139,071,536