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Document And Entity Information
Jul. 21, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Period End Date Jul. 21, 2025
Entity Registrant Name Fidelity® Ethereum Fund
Entity Central Index Key 0002000046
Entity Emerging Growth Company true
Entity File Number 001-42163
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 99-6342530
Entity Address, Address Line One 245 Summer Street V13E
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02210
City Area Code 800
Local Phone Number 343-3548
Entity Information, Former Legal or Registered Name Not Applicable
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Ex Transition Period false
Title of 12(b) Security Shares of Beneficial Interest ofFidelity Ethereum Fund
Trading Symbol FETH
Security Exchange Name CboeBZX