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Condensed Statement of Changes in Partners' Capital) (Parenthetical) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Statement of Changes in Partners' Capital        
Addition of partnership units 118,525,000 8,287,500 190,162,500 15,750,000
Redemption of partnership units 26,376,397 8,762,500 34,888,897 19,837,500