Statements of Changes in Net Assets (Unaudited) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Assets, Beginning of Period	$ 13,346,432,796	$ 12,556,331,670	$ 11,544,738,146	$ 10,798,666,536	$ 11,548,425,460	$ 10,147,507,137	$ 11,544,738,146	$ 10,147,507,137
Operations:
Net investment loss	(9,387,230)	(7,621,405)	(7,619,352)	(6,488,704)	(7,411,485)	(6,856,858)	(24,627,987)	(20,757,047)
Net realized gain (loss)	18,342,777	22,410,307	5,847,432	(4,168,420)	28,860,217	2,561,066	46,600,516	27,252,863
Net change in unrealized appreciation/depreciation	706,990,277	1,012,499,328	114,176,495	(532,059,056)	(696,835,646)	205,503,998	1,833,666,100	(1,023,390,704)
Net increase (decrease) in net assets resulting from operations	715,945,824	1,027,288,230	112,404,575	(542,716,180)	(675,386,914)	201,208,206	1,855,638,629	(1,016,894,888)
Capital Share Transactions:
Contributions for Shares issued	2,411,110,878	739,781,522	1,064,902,289	326,017,394	918,575,987	1,237,667,439
Distributions for Shares redeemed	(120,691,118)	(976,968,626)	(165,713,340)	(369,770,728)	(992,947,997)	(37,957,322)
Net increase (decrease) in net assets from capital share transactions	2,290,419,760	(237,187,104)	899,188,949	(43,753,334)	(74,372,010)	1,199,710,117
Increase (decrease) in net assets	3,006,365,584	790,101,126	1,011,593,524	(586,469,514)	(749,758,924)	1,400,918,323
Net Assets, End of Period	$ 16,352,798,380	$ 13,346,432,796	$ 12,556,331,670	$ 10,212,197,022	$ 10,798,666,536	$ 11,548,425,460	$ 16,352,798,380	$ 10,212,197,022
Shares issued and redeemed
Shares issued (in shares)							312,500,000	196,850,000
Shares redeemed (in shares)							(101,400,000)	(114,500,000)
Net increase in Shares issued and outstanding (in shares)							211,100,000	82,350,000