Statements of Changes in Net Assets - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Assets, Beginning of Year	$ 17,628,525,082	$ 11,544,738,146	$ 10,147,507,137
Operations:
Net investment loss	(65,443,749)	(35,318,380)	(27,533,111)
Net realized gain	496,187,915	65,788,134	23,491,426
Net change in unrealized appreciation/depreciation	4,373,267,647	2,245,532,373	(194,080,795)
Net increase (decrease) in net assets resulting from operations	4,804,011,813	2,276,002,127	(198,122,480)
Capital Share Transactions:
Contributions for Shares issued	12,103,493,289	5,226,042,788	3,078,649,161
Distributions for Shares redeemed	(2,617,761,048)	(1,418,257,979)	(1,483,295,672)
Net increase in net assets from capital share transactions	9,485,732,241	3,807,784,809	1,595,353,489
Increase in net assets	14,289,744,054	6,083,786,936	1,397,231,009
Net Assets, End of Year	$ 31,918,269,136	$ 17,628,525,082	$ 11,544,738,146
Shares issued and redeemed
Shares issued (in shares)	719,300,000	383,350,000	247,000,000
Shares redeemed (in shares)	(160,000,000)	(112,400,000)	(121,700,000)
Net increase in Shares issued and outstanding (in shares)	559,300,000	270,950,000	125,300,000