Financial Highlights - Summary of Per Share Performance (Details)	2 Months Ended
	Sep. 30, 2024 $ / shares	[1]
Financial Highlights [Line Items]
Net asset value per Share, beginning of period	$ 26.21	[2]
Net investment loss	0	[3]
Net realized and unrealized gain (loss) on investment in ether	(6.23)
Net change in net assets from operations	(6.23)	[4]
Net asset value per Share, end of period	$ 19.98
Total return, at net asset value	(23.77%)	[5],[6]
Ratio to average net assets
Net investment loss	0.00%	[7]
Net expenses	0.00%	[7]
Franklin Ethereum ETF [Member]
Financial Highlights [Line Items]
Net asset value per Share, beginning of period	$ 26.21	[2]
Net investment loss	0	[3]
Net realized and unrealized gain (loss) on investment in ether	(6.23)
Net change in net assets from operations	(6.23)	[4]
Net asset value per Share, end of period	$ 19.98
Total return, at net asset value	(23.77%)	[5],[6]
Ratio to average net assets
Net investment loss	0.00%	[7]
Net expenses	0.00%	[7]

[1] No comparative period presented as the Fund’s operations commenced on July 23, 2024.

[2] The amount shown represents the NAV per share at commencement of the Fund’s investment operations. This amount includes proceeds to the Fund from the initial ether seed creation transaction conducted on June 27, 2024. Prior to June 27, 2024, 4,000 shares were acquired on May 21, 2024 at per share value of $25. Total proceeds to the Fund from the sale of the Initial Seed Shares were $100,000. On June 27, 2024, the Initial Seed Shares were redeemed for $100,000 and the Seed Capital Investor purchased two creation units in a cash transaction comprised of a total of 100,000 Shares at a per-Share price based on 380 ether per Creation Unit (or 0.0076 ether per Share), for a total of 760 ether (the “Seed Creation Units”). The cash proceeds to the Fund from the sale of the Seed Creation Units were used by the Fund to purchase 760 ether at the price of $3,446.37 per ether on June 27, 2024 (exclusive of transaction and other costs incurred in connection with the conversion of the cash proceeds to ether, which were paid by the Seed Capital Investor). Thus, the ultimate total proceeds to the Fund from the sale of the Seed Creation Units were $2,619,241.20 (an amount representing 760 ether).

[3] Calculated using average Shares outstanding.

[4] The amount shown for a share outstanding may not agree with the change in the aggregate gains and losses on investment for the period because of the timing of transactions in the Fund’s shares in relation to fluctuating market values for the Fund’s underlying investment.

[5] Percentage is not annualized.

[6] Total Return at NAV is calculated assuming an initial investment made at the NAV at the beginning of the period, and redemption of Shares at NAV on the last day of the period. Total Return at NAV as shown above includes adjustments in accordance with U.S. GAAP.

[7] Annualized based on the period from July 23, 2024 (Commencement of operations) to September 30, 2024.