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Condensed Statements 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 8,000,000 4,600,000 46,600,000 24,000,000
Redemption of partnership units (17,500,000) (8,100,000) (45,000,000) (21,300,000)