Organization - Additional Information (Details)					3 Months Ended	6 Months Ended
		Jan. 08, 2024 USD ($) Creationunits $ / shares shares	Dec. 15, 2023 USD ($) $ / shares shares	Sep. 06, 2023 Creationunits	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Nature Of Operations [Line Items]
Date of incorporation						Sep. 06, 2023
Security exchange name						CboeBZX
Threshold multiples in which shares are issued | Creationunits				50,000
Trading symbol						EZBC
Stock issued during the period value new issues	[1]				$ 107,983,445	$ 209,726,374
Stock redeemed during the period value	[1],[2]				(31,419,769)	$ (65,718,591)
Per share cost of investment invesment company | $ / shares		$ 44,973.58
Payment for purchase of investment operating activity		$ 2,608,467.81
BATS [Member]
Nature Of Operations [Line Items]
Security exchange name						CboeBZX
Initial Seed Shares [Member]
Nature Of Operations [Line Items]
Stock issued during the period shares new issues | shares			4,000
Investment company issuance of shares per share | $ / shares			$ 25
Stock issued during the period value new issues			$ 100,000
Stock redeemed during the period value		$ 100,000
Seed Creation Units [Member]
Nature Of Operations [Line Items]
Number of creation units | Creationunits		2
Bitcoins [Member]
Nature Of Operations [Line Items]
Investment owned number of units		58
Purchase of investment in number of units		58
Bitcoins [Member] | Seed Creation Units [Member]
Nature Of Operations [Line Items]
Stock issued during the period shares new issues | shares		58
Number of bitcoins per creation unit		29
Number of bitcoins per share		0.00058
Common Stock [Member] | Seed Creation Units [Member]
Nature Of Operations [Line Items]
Stock issued during the period shares new issues | shares		100,000
Franklin Bitcoin ETF [Member]
Nature Of Operations [Line Items]
Date of incorporation						Sep. 06, 2023
Threshold multiples in which shares are issued | Creationunits				50,000
Trading symbol						EZBC
Stock issued during the period value new issues	[1]				107,983,445	$ 209,726,374
Stock redeemed during the period value	[1],[2]				$ (31,419,769)	$ (65,718,591)
Per share cost of investment invesment company | $ / shares		$ 44,973.58
Payment for purchase of investment operating activity		$ 2,608,467.81
Franklin Bitcoin ETF [Member] | BATS [Member]
Nature Of Operations [Line Items]
Security exchange name						CboeBZX
Franklin Bitcoin ETF [Member] | Initial Seed Shares [Member]
Nature Of Operations [Line Items]
Stock issued during the period shares new issues | shares			4,000
Investment company issuance of shares per share | $ / shares			$ 25
Stock issued during the period value new issues			$ 100,000
Stock redeemed during the period value		$ 100,000
Franklin Bitcoin ETF [Member] | Seed Creation Units [Member]
Nature Of Operations [Line Items]
Number of creation units | Creationunits		2
Franklin Bitcoin ETF [Member] | Bitcoins [Member]
Nature Of Operations [Line Items]
Investment owned number of units		58
Purchase of investment in number of units		58
Franklin Bitcoin ETF [Member] | Bitcoins [Member] | Seed Creation Units [Member]
Nature Of Operations [Line Items]
Stock issued during the period shares new issues | shares		58
Number of bitcoins per creation unit		29
Number of bitcoins per share		0.00058
Franklin Bitcoin ETF [Member] | Common Stock [Member] | Seed Creation Units [Member]
Nature Of Operations [Line Items]
Stock issued during the period shares new issues | shares		100,000

[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.