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Statements of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Beginning Balance at Dec. 31, 2014 $ 1,277,679,873 $ 0 $ 1,277,679,873
Addition of partnership shares 9,173,312,546 0 9,173,312,546
Redemption of partnership shares (6,040,509,746) 0 (6,040,509,746)
Net income (loss) (1,288,412,920) 0 (1,288,412,920)
Ending Balance at Dec. 31, 2015 $ 3,122,069,753 0 3,122,069,753
Net asset value, beginning of year at Dec. 31, 2014 $ 20.15    
Net asset value, end of year at Dec. 31, 2015 $ 11.02    
Addition of partnership shares $ 4,450,820,824 0 4,450,820,824
Redemption of partnership shares (5,137,486,718) 0 (5,137,486,718)
Net income (loss) 666,552,810 0 666,552,810
Ending Balance at Dec. 31, 2016 $ 3,101,956,669 0 3,101,956,669
Net asset value, end of year at Dec. 31, 2016 $ 11.71    
Addition of partnership shares $ 4,177,335,976 0 4,177,335,976
Redemption of partnership shares (5,338,733,632) 0 (5,338,733,632)
Net income (loss) 78,972,397 0 78,972,397
Ending Balance at Dec. 31, 2017 $ 2,019,531,410 $ 0 $ 2,019,531,410
Net asset value, end of year at Dec. 31, 2017 $ 12.08