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Condensed Statement of Changes in Partners' Capital) (Parenthetical) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Condensed Statement of Changes in Partners' Capital        
Addition of partnership units 15,100,000 12,762,500 205,262,500 28,512,500
Redemption of partnership units 39,600,000 12,487,500 74,488,897 32,325,000