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Condensed Statement of Changes in Partners' Capital) (Parenthetical) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Statement of Changes in Partners' Capital      
Addition of partnership units 207,062,500 34,137,500 38,437,500
Redemption of partnership units (108,888,897) (41,837,500) (40,187,500)