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Statements of Changes in Partners' Capital (Parenthetical) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Addition of partnership units 456,900,000 573,900,000 166,500,000
Redemption of partnership units 475,100,000 354,100,000 119,400,000