v3.25.2
Cover - shares
 3 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Information [Line Items]    
Entity Registrant Name FRANKLIN ETHEREUM TRUST  
Entity Central Index Key 0002011535  
Entity File Number 001-042169  
Entity Tax Identification Number 99-6268769  
Entity Incorporation, State or Country Code DE  
Current Fiscal Year End Date --03-31  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One One Franklin Parkway  
Entity Address, City or Town San Mateo  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94403  
Entity Phone Fax Numbers [Line Items]    
City Area Code 650  
Local Phone Number 312-2000  
Entity Listings [Line Items]    
Title of 12(b) Security Franklin Ethereum ETF Shares  
Trading Symbol EZET  
Security Exchange Name CboeBZX  
Entity Common Stock, Shares Outstanding   2,650,000