Fair Value of Ether - Additional Information (Details)	Jun. 30, 2025 Ethereum $ / shares	Dec. 31, 2024 Ethereum $ / shares
Fair Value Disclosures [Abstract]
Investment owned balance shares held by custodian \| Ethereum	528,670.39510393	470,875.75775088
Ether Fair value per share \| $ / shares	$ 2,516.23	$ 3,340.4

Investment owned balance shares held by custodian.

No definition available.

Name:	eth_InvestmentOwnedBalanceSharesHeldByCustodian
Namespace Prefix:	eth_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant