v3.25.2
Cover Page - shares
6 Months Ended
Jun. 30, 2025
Jul. 28, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Document Period End Date Jun. 30, 2025  
Document Quarterly Report true  
Document Transition Report false  
Current Fiscal Year End Date --12-31  
Entity Registrant Name Grayscale Ethereum Classic Trust (ETC)  
Entity Central Index Key 0001705181  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Common Stock, Shares Outstanding   13,993,800
Entity Shell Company false  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity File Number 000-56309  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 82-6239281  
Entity Address, Address Line One c/o Grayscale Investments Sponsors, LLC  
Entity Address, Address Line Two 290 Harbor Drive, 4th Floor  
City Area Code 212  
Local Phone Number 668-1427  
Entity Address, City or Town Stamford  
Entity Address, Postal Zip Code 06902  
Entity Address, State or Province CT  
Title of 12(g) Security Grayscale Ethereum Classic Trust (ETC) Shares  
Trading Symbol ETCG