v3.25.2
COMBINED FINANCIAL HIGHLIGHTS (Tables)
 3 Months Ended
Jun. 30, 2025
COMBINED FINANCIAL HIGHLIGHTS [Abstract]  
Schedule of Financial Highlights
       
   For the Three
Months Ended
June 30, 2025*		  
Net asset value per Share, beginning of period
$
13.94  
Net investment loss(a)
   (0.01
)
Net realized and unrealized gain (loss) on investment in ether
  5.06  
Net change in net assets from operations(b)
  5.05  
Net asset value per Share, end of period
$
18.99  
Total return, at net asset value(c)(d)
  36.23
%
Ratio to average net assets(e)
     
Net investment loss
  (0.19
)%
Gross expenses
  0.19
%
Net expenses
  0.19
%
(a)
Calculated using average Shares outstanding.
(b)
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.
(c)
Calculation based on the change in net asset value of a Share during the period. Total return for periods of less than a year are not annualized.
(d)
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.
(e)
Annualized.
Franklin Ethereum ETF [Member]  
COMBINED FINANCIAL HIGHLIGHTS [Abstract]  
Schedule of Financial Highlights
       
 
For the Three
Months Ended
June 30, 2025*		  
Net asset value per Share, beginning of period
$
13.94  
Net investment loss(a)
  (0.01
)
Net realized and unrealized gain (loss) on investment in ether
  5.06  
Net change in net assets from operations(b)
  5.05  
Net asset value per Share, end of period
$
18.99  
Total return, at net asset value(c)(d)
  36.23
%
Ratio to average net assets(e)
     
Net investment loss
  (0.19
)%
Gross expenses
  0.19
%
Net expenses
  0.19
%
(a)
Calculated using average Shares outstanding.
(b)
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.
(c)
Calculation based on the change in net asset value of a Share during the period. Total return for periods of less than a year are not annualized.
(d)
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.
(e)
Annualized.