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Financial Highlights - Schedule of Financial Highlights (Details) - $ / shares
 3 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2025
Financial Highlights [Abstract]        
Net asset value per Share, beginning of period $ 12.57 $ 17.12 $ 17.04 [1] $ 16.7
Net investment loss [2] (0.01) (0.02)
Net realized and change in unrealized gain (loss) on investment in ether(3) [3] 8.22 (4.15) (4.07) 4.1
Net change in net assets from operations 8.21 (4.15) (4.07) 4.08
Net asset value per Share, end of period $ 20.78 $ 12.97 $ 12.97 $ 20.78
Total return, at net asset value [4],[5] 65.31% (24.24%) (23.88%) 24.43%
Ratio to average net assets(5)        
Net investment income (loss) [6] (0.21%) (0.21%)
Gross expenses [6] 0.21% 0.21% 0.21% 0.21%
Net expenses [6] 0.21% 0.20%
[1] The amount represents the NAV per Share on June 18, 2024, the Seed Capital Purchase Date.
[2] Calculated using average Shares outstanding.
[3] The amount shown for a share outstanding throughout the period may not agree with the change in the aggregate gains and losses for such period because of the timing of sales and repurchases of the Trust's shares in relation to fluctuating market values for the Trust.
[4] Total return is calculated based on the change in value during the period and is not annualized. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from the Trust.
[5] Not annualized.
[6] Annualized.