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Statements of Changes in Partners' Capital - USD ($)
General Partner [Member]
Limited Partners [Member]
Total
Balances at Dec. 31, 2016 $ 0 $ 537,810,802 $ 537,810,802
Addition of partnership shares 0 1,781,669,130 1,781,669,130
Redemption of partnership shares 0 (1,473,944,224) (1,473,944,224)
Net income (loss) 0 (193,443,975) (193,443,975)
Balances at Dec. 31, 2017 0 652,091,733 $ 652,091,733
Net asset value, beginning of period at Dec. 31, 2016 [1]     $ 37.18
Net asset value, end of period at Dec. 31, 2017 [1]     $ 23.34
Addition of partnership shares 0 1,744,841,011 $ 1,744,841,011
Redemption of partnership shares 0 (2,258,955,683) (2,258,955,683)
Net income (loss) 0 110,037,462 110,037,462
Balances at Dec. 31, 2018 0 248,014,523 $ 248,014,523
Net asset value, end of period at Dec. 31, 2018     $ 24.35
Addition of partnership shares 0 921,642,412 $ 921,642,412
Redemption of partnership shares 0 (647,466,427) (647,466,427)
Net income (loss) 0 (77,617,254) (77,617,254)
Balances at Dec. 31, 2019 $ 0 $ 444,573,254 $ 444,573,254
Net asset value, end of period at Dec. 31, 2019     $ 16.91
[1] On January 4, 2018, there was a 1for4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.