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Statement of Changes in Partners' Capital (Parenthetical) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Changes in Partners' Capital      
Addition of partnership units 86,500,000 44,600,000 67,200,000
Redemption of partnership units (67,700,000) (28,500,000) (84,957,031)