Combined Statement of Assets and Liabilities (Parenthetical) - USD ($)	6 Months Ended
	Sep. 30, 2024	Mar. 31, 2024
Investment in bitcoin	$ 423,417,042	$ 280,623,942
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized, unlimited	Unlimited
Franklin Bitcoin ETF [Member]
Investment in bitcoin	$ 423,417,042	$ 280,623,942
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized, unlimited	Unlimited