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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ 228,569,109    
Net asset value, beginning of period at Dec. 31, 2014 $ 20.15    
Net asset value, end of period at Jun. 30, 2015 $ 19.93    
Beginning Balance at Dec. 31, 2015 $ 3,122,069,753 $ 0 $ 3,122,069,753
Addition of 211,400,000 partnership shares 1,903,353,210 0 1,903,353,210
Redemption of 203,200,000 partnership shares (2,119,549,440) 0 (2,119,549,440)
Net income (loss) 462,453,889 0 462,453,889
Ending Balance at Jun. 30, 2016 $ 3,368,327,412 $ 0 $ 3,368,327,412
Net asset value, beginning of period at Dec. 31, 2015 $ 11.02    
Net asset value, end of period at Jun. 30, 2016 $ 11.56