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Statements of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Balances at Dec. 31, 2014 $ 650,353,579 $ 0 $ 650,353,579
Addition of partnership shares 1,622,768,501 0 1,622,768,501
Redemption of partnership shares (1,513,008,177) 0 (1,513,008,177)
Net income (loss) (245,141,023) 0 (245,141,023)
Balances at Dec. 31, 2015 $ 514,972,880 0 514,972,880
Net asset value, beginning of year at Dec. 31, 2014 [1],[2] $ 58.50    
Net asset value, end of year at Dec. 31, 2015 [1],[2] $ 34.76    
Addition of partnership shares $ 731,029,440 0 731,029,440
Redemption of partnership shares (806,923,700) 0 (806,923,700)
Net income (loss) 98,732,182 0 98,732,182
Balances at Dec. 31, 2016 $ 537,810,802 0 537,810,802
Net asset value, end of year at Dec. 31, 2016 [1],[2],[3] $ 37.18    
Addition of partnership shares $ 1,781,669,130 0 1,781,669,130
Redemption of partnership shares (1,473,944,224) 0 (1,473,944,224)
Net income (loss) (193,443,975) 0 (193,443,975)
Balances at Dec. 31, 2017 $ 652,091,733 $ 0 $ 652,091,733
Net asset value, end of year at Dec. 31, 2017 [1],[2],[3] $ 23.34    
[1] On January 4, 2018, there was a 1-for-4 reverse share split. The Financial Highlights have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.
[2] On January 4, 2018, there was a 1-for-4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.
[3] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.