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Statements of Changes in Partners' Capital (Parenthetical) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Addition of partnership units 307,500,000 410,300,000 456,900,000
Redemption of partnership units 321,500,000 508,100,000 475,100,000