SIGNIFICANT ACCOUNTING POLICIES (Details) |
12 Months Ended |
|---|---|
|
Mar. 31, 2026
USD ($)
| |
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | |
| Sponsor's fee rate | 0.19% |
| Threshold value of the fund's assets on the basis of which Sponsor's fee is determined | $ 10,000,000,000 |
| Accrued sponsor fee | 108,260 |
| Extraordinary or non-routine expenses | $ 0 |
| Number of business days to transfer ownership of Ethereum | 1 day |
| Franklin Ethereum ETF [Member] | |
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | |
| Sponsor's fee rate | 0.19% |
| Accrued sponsor fee | $ 108,260 |
| Extraordinary or non-routine expenses | 0 |
| Initial value of the funds assets on the basis of which fees is determined | 10,000,000,000 |
| Maximum [Member] | |
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | |
| Ordinary legal fees and expenses assumed by the Sponsor | 500,000 |
| Maximum [Member] | Franklin Ethereum ETF [Member] | |
| SIGNIFICANT ACCOUNTING POLICIES [Abstract] | |
| Ordinary legal fees and expenses assumed by the Sponsor | $ 500,000 |