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Condensed Statement of Changes in Partners' Capital (Parenthetical) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Condensed Statement of Changes in Partners' Capital (Unaudited)        
Addition of partnership shares   26,600,000   28,750,000
Redemption of partnership unit shares (2,150,000) (12,300,000) (4,050,000) (12,450,000)