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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ (246,118,574)    
Net asset value, beginning of period at Dec. 31, 2016 $ 11.71    
Net asset value, end of period at Sep. 30, 2017 $ 10.44    
Beginning Balance at Dec. 31, 2017 $ 2,019,531,410 $ 0 $ 2,019,531,410
Addition of 191,600,000 partnership shares 2,556,399,027 0 2,556,399,027
Redemption of 245,300,000 partnership shares (3,292,631,276) 0 (3,292,631,276)
Net income (loss) 472,609,980 0 472,609,980
Ending Balance at Sep. 30, 2018 $ 1,755,909,141 $ 0 $ 1,755,909,141
Net asset value, beginning of period at Dec. 31, 2017 $ 12.08    
Net asset value, end of period at Sep. 30, 2018 $ 15.47