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Condensed Statements of Changes in Partners' Capital (Parenthetical) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Statement of Changes in Partners' Capital        
Addition of partnership units 21,500,000 8,400,000 38,600,000 19,400,000
Redemption of partnership units (10,500,000) (2,900,000) (27,500,000) (13,200,000)