v3.26.1
COMBINED FINANCIAL HIGHLIGHTS (Tables)
 3 Months Ended
Jun. 30, 2026
COMBINED FINANCIAL HIGHLIGHTS [Abstract]  
Summary of Per Share Performance
         
     For the Three
Months  
Ended  
June 30, 2026 		     For the Three
Months  
Ended  
June 30, 2025 		 
           
Net asset value per Share, beginning of period  $39.39   $48.05 
Net investment loss(a)   (0.02)    (0.03) 
Net realized and unrealized gain (loss) on investment in bitcoin   (5.22)    14.84 
Net change in net assets from operations(b)   (5.24)    14.81 
Net asset value per Share, end of period  $34.15   $62.86 
           
Total return, at net asset value(c)   (13.30)%   30.82%
           
Ratio to average net assets(d)          
Net investment loss   (0.19)%   (0.19)%
Gross expenses   0.19%   0.19%
Net expenses   0.19%   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)
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. Total return for periods of less than a year are not annualized.
(d)
Annualized.
Franklin Bitcoin ETF [Member]  
COMBINED FINANCIAL HIGHLIGHTS [Abstract]  
Summary of Per Share Performance
         
    
For the Three
Months
Ended
June 30, 2026
    
For the Three
Months
Ended
June 30, 2025
 
           
Net asset value per Share, beginning of period
  $39.39   $48.05 
Net investment loss(a)
   (0.02)    (0.03) 
Net realized and unrealized gain (loss) on investment in bitcoin
   (5.22)    14.84 
Net change in net assets from operations(b)
   (5.24)    14.81 
Net asset value per Share, end of period
  $34.15   $62.86 
           
Total return, at net asset value(c)
   (13.30)%   30.82%
           
Ratio to average net assets(d)
          
Net investment loss
   (0.19)%   (0.19)%
Gross expenses
   0.19%   0.19%
Net expenses
   0.19%   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)
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. Total return for periods of less than a year are not annualized.
(d)
Annualized.