Significant Accounting Policies - Summary of Changes in Shares (Details) - USD ($)		3 Months Ended	6 Months Ended
		Sep. 30, 2024	Sep. 30, 2024
Summary Of Changes In The Shares Issued And Outstanding [Line Items]
Beginning Balance (in Shares)	[1]	10,150,000	8,350,000
Beginning Balance	[1],[2]	$ 348,068,049	$ 280,623,942
Creation of Shares (in Shares)	[1]	3,050,000	5,850,000
Creation of Shares	[1],[2]	$ 107,983,445	$ 209,726,374
Redemption of Shares (in Shares)	[1]	(950,000)	(1,950,000)
Redemption of Shares	[1],[2]	$ (31,419,769)	$ (65,718,591)
Ending Balance (in Shares)	[1]	12,250,000	12,250,000
Ending Balance	[1],[2]	$ 424,631,725	$ 424,631,725
Franklin Bitcoin ETF [Member]
Summary Of Changes In The Shares Issued And Outstanding [Line Items]
Beginning Balance (in Shares)	[1]	10,150,000	8,350,000
Beginning Balance	[1],[2]	$ 348,068,049	$ 280,623,942
Creation of Shares (in Shares)	[1]	3,050,000	5,850,000
Creation of Shares	[1],[2]	$ 107,983,445	$ 209,726,374
Redemption of Shares (in Shares)	[1]	(950,000)	(1,950,000)
Redemption of Shares	[1],[2]	$ (31,419,769)	$ (65,718,591)
Ending Balance (in Shares)	[1]	12,250,000	12,250,000
Ending Balance	[1],[2]	$ 424,631,725	$ 424,631,725

[1] No comparative period presented as the Fund’s operations commenced on January 11, 2024.

[2] Dollar amount of balance represents the cumulative fair value of creation of shares less the redemption of shares, at the time of the specific creation or redemption.