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Statements of Changes in Net Assets - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Assets, Beginning of Year $ 11,160,084,971 $ 12,249,234,223 $ 14,791,792,720
Operations:      
Net investment loss (53,561,823) (56,435,296) (71,208,965)
Net realized gain (loss) 286,497,320 (177,029,224) 1,362,285,165
Net change in unrealized appreciation/depreciation (361,918,369) 215,447,290 (3,401,406,431)
Net decrease in net assets resulting from operations (128,982,872) (18,017,230) (2,110,330,231)
Capital Share Transactions:      
Contributions for Shares issued 3,580,116,083 3,608,993,778 6,742,609,430
Distributions for Shares redeemed (4,222,040,407) (4,680,125,800) (7,174,837,696)
Net decrease in net assets from capital share transactions (641,924,324) (1,071,132,022) (432,228,266)
Decrease in net assets (770,907,196) (1,089,149,252) (2,542,558,497)
Net Assets, End of Year $ 10,389,177,775 $ 11,160,084,971 $ 12,249,234,223
Shares issued and redeemed      
Shares issued (in shares) 167,250,000 175,900,000 275,950,000
Shares redeemed (in shares) (196,800,000) (243,150,000) (303,100,000)
Net decrease in Shares issued and outstanding (in shares) (29,550,000) (67,250,000) (27,150,000)