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Condensed Statement of Changes in Partners' Capital (Parenthetical) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Condensed Statement of Changes in Partners' Capital        
Addition of partnership units 5,700,000 8,000,000 12,700,000 46,600,000
Redemption of partnership units (7,100,000) (17,500,000) (37,400,000) (45,000,000)