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Statements of Changes in Net Assets (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Net Assets, Beginning of Period $ 8,883,456,887 $ 5,505,117,093 $ 6,540,758,565 $ 4,919,140,506 $ 4,668,431,637 $ 4,904,036,623 $ 6,540,758,565 $ 4,904,036,623
Operations:                
Net investment loss (16,902,576) (8,953,394) (7,676,949) (7,818,311) (5,821,811) (5,951,914) (33,532,919) (19,592,036)
Net realized gain (loss) 650,112,661 (11,142,869) (9,570,709) 9,532,932 (17,462,196) (43,054,318) 629,399,083 (50,983,582)
Net change in unrealized appreciation/depreciation 2,589,764,531 1,686,694,147 (1,423,211,664) 710,091,263 57,866,685 (69,197,383) 2,853,247,014 698,760,565
Net increase (decrease) in net assets resulting from operations 3,222,974,616 1,666,597,884 (1,440,459,322) 711,805,884 34,582,678 (118,203,615) 3,449,113,178 628,184,947
Capital Share Transactions:                
Contributions for Shares issued 2,950,693,999 1,962,530,775 889,817,438 1,274,150,418 300,557,309 185,279,712    
Distributions for Shares redeemed (2,035,281,500) (250,788,865) (484,999,588) (287,948,518) (84,431,118) (302,681,083)    
Net increase in net assets from capital share transactions 915,412,499 1,711,741,910 404,817,850 986,201,900 216,126,191 (117,401,371)    
Increase (decrease) in net assets 4,138,387,115 3,378,339,794 (1,035,641,472) 1,698,007,784 250,708,869 (235,604,986)    
Net Assets, End of Period $ 13,021,844,002 $ 8,883,456,887 $ 5,505,117,093 $ 6,617,148,290 $ 4,919,140,506 $ 4,668,431,637 $ 13,021,844,002 $ 6,617,148,290
Shares issued and redeemed                
Shares issued (in shares)             333,100,000 116,200,000
Shares redeemed (in shares)             (131,350,000) (43,950,000)
Net increase (decrease) in Shares issued and outstanding (in shares)             201,750,000 72,250,000