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Condensed Statements of Financial Condition - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 3,215,581,885 $ 2,725,177,054
Equity in trading accounts:    
Cash and cash equivalents 463,956,958 551,734,919
Unrealized gain (loss) on open commodity futures contracts (96,981,140) (138,508,060)
Receivable for shares sold 0 38,584,910
Dividends receivable 126,349 8,930
Directors' fees and insurance receivable 90,500 0
Prepaid registration fees 1,464,784 726,055
ETF transaction fees receivable 4,000 5,000
Total assets 3,584,243,336 3,177,728,808
Liabilities and Partners' Capital    
Payable for shares redeemed 68,211,780 52,855,674
General Partner management fees payable (Note 3) 1,478,531 1,179,092
Professional fees payable 1,222,117 1,205,862
Brokerage commissions payable 293,961 260,961
Directors' fees and insurance payable 0 42,863
License fees payable 160,216 114,603
Total liabilities $ 71,366,605 $ 55,659,055
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner $ 0 $ 0
Limited Partners 3,512,876,731 3,122,069,753
Total Partners' Capital 3,512,876,731 3,122,069,753
Total liabilities and partners' capital $ 3,584,243,336 $ 3,177,728,808
Limited Partners' shares outstanding 360,500,000 283,200,000
Net asset value per share $ 9.74 $ 11.02
Market value per share $ 9.7 $ 11