Fair Value of Ether - Changes in Quantity of ETF and Respective Fair Value (Details) $ in Thousands		1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
		Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Ethereum		Dec. 31, 2024 USD ($) Ethereum	Jun. 30, 2025 USD ($) Ethereum
Fair Value Disclosures [Abstract]
Beginning balance, Quantity | Ethereum					0	470,875.75775088
Ether contributed, Quantity | Ethereum					216,682.35550389	106,063.76794599
Ether contributed from Initial Distribution, Quantity | Ethereum	[1]				292,262.9891335
Ether redeemed, Quantity | Ethereum					(38,069.58688651)	(47,954.16582573)
Ether distributed for Sponsor's Fee, related party, Quantity | Ethereum					0	(314.96476721)
Net change in unrealized depreciation on investment in Ether, Quantity | Ethereum					0	0
Net realized gain on investment in Ether sold to pay expenses, Quantity | Ethereum					0	0
Net realized loss on investment in Ether sold for redemption of Shares, Quantity | Ethereum					0	0
Ending Balance ,Quantity | Ethereum			528,670.39510393		470,875.75775088	528,670.39510393
Beginning Balance, Fair Value | $					$ 0	$ 1,572,914
Ether contributed, Fair Value | $					706,933	265,463
Ether contributed from Initial Distribution, Fair Value | $	[1]				1,010,935
Ether redeemed, Fair Value | $					(112,142)	(119,392)
Ether distributed for Sponsor's Fee, related party, Fair Value | $					0	729
Net change in unrealized depreciation on investment in Ether | $		$ 0	$ 335,217	[2]	(17,499)	(346,430)	[2]
Net realized gain on investment in Ether sold to pay expenses | $			(188)	[2]	0	(310)	[2]
Net realized loss on investment in Ether sold for redemption of Shares | $			(6,067)	[2]	(15,313)	(41,260)	[2]
Ending balance, Fair Value | $			$ 1,330,256		$ 1,572,914	$ 1,330,256

[1] Represents the impact of the Initial Distribution of 292,262.98913350 Ether, with a value of approximately $1,010.9 million from Grayscale Ethereum Trust ETF, completed on July 23, 2024, as discussed in Note 4.

[2] No comparative financial statements have been provided as the Trust’s operations commenced on July 23, 2024. Prior to the commencement of operations on July 23, 2024, the Sponsor redeemed the initial seed capital of 10,000 shares for $100,000.