Statements of Changes in Net Assets (Unaudited) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Assets, Beginning of Period	$ 5,505,117,093	$ 6,540,758,565	$ 4,668,431,637	$ 4,904,036,623	$ 6,540,758,565	$ 4,904,036,623
Operations:
Net investment loss	(8,953,394)	(7,676,949)	(5,821,811)	(5,951,914)	(16,630,343)	(11,773,725)
Net realized loss	(11,142,869)	(9,570,709)	(17,462,196)	(43,054,318)	(20,713,578)	(60,516,514)
Net change in unrealized appreciation/depreciation	1,686,694,147	(1,423,211,664)	57,866,685	(69,197,383)	263,482,483	(11,330,698)
Net increase (decrease) in net assets resulting from operations	1,666,597,884	(1,440,459,322)	34,582,678	(118,203,615)	226,138,562	(83,620,937)
Capital Share Transactions:
Contributions for Shares issued	1,962,530,775	889,817,438	300,557,309	185,279,712
Distributions for Shares redeemed	(250,788,865)	(484,999,588)	(84,431,118)	(302,681,083)
Net increase in net assets from capital share transactions	1,711,741,910	404,817,850	216,126,191	(117,401,371)
Increase (decrease) in net assets	3,378,339,794	(1,035,641,472)	250,708,869	(235,604,986)
Net Assets, End of Period	$ 8,883,456,887	$ 5,505,117,093	$ 4,919,140,506	$ 4,668,431,637	$ 8,883,456,887	$ 4,919,140,506
Shares issued and redeemed
Shares issued (in shares)					193,500,000	34,150,000
Shares redeemed (in shares)					(47,250,000)	(26,800,000)
Net increase (decrease) in Shares issued and outstanding (in shares)					146,250,000	7,350,000