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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        
Addition of partnership units 21,500,000 7,000,000 38,600,000  
Redemption of partnership units (6,700,000) (10,500,000) (30,300,000) (27,500,000)