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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ (253,155,304)    
Net asset value, beginning of period at Dec. 31, 2016 $ 11.71    
Net asset value, end of period at Mar. 31, 2017 $ 10.62    
Beginning Balance at Dec. 31, 2017 $ 2,019,531,410 $ 0 $ 2,019,531,410
Addition of 86,800,000 partnership shares 1,085,854,618 0 1,085,854,618
Redemption of 113,300,000 partnership shares (1,433,712,290) 0 (1,433,712,290)
Net income (loss) 170,897,874 0 170,897,874
Ending Balance at Mar. 31, 2018 $ 1,842,571,612 $ 0 $ 1,842,571,612
Net asset value, beginning of period at Dec. 31, 2017 $ 12.08    
Net asset value, end of period at Mar. 31, 2018 $ 13.1