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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ 61,641,050    
Net asset value, beginning of period at Dec. 31, 2013 $ 35.23    
Net asset value, end of period at Jun. 30, 2014 $ 38.86    
Beginning Balance at Dec. 31, 2014 $ 1,277,679,873 $ 0 $ 1,277,679,873
Addition of partnership shares 4,426,610,548 0 4,426,610,548
Redemption of partnership shares (3,652,465,037) 0 (3,652,465,037)
Net income (loss) 228,569,109 0 228,569,109
Ending Balance at Jun. 30, 2015 $ 2,280,394,493 $ 0 $ 2,280,394,493
Net asset value, beginning of period at Dec. 31, 2014 $ 20.15    
Net asset value, end of period at Jun. 30, 2015 $ 19.93