Combined Statements of Assets and Liabilities (Parentheticals) - USD ($)	9 Months Ended	12 Months Ended
Dec. 31, 2025	Mar. 31, 2025	Jan. 02, 2026
Investment in bitcoin, at cost	$ 426,448,438	$ 313,983,408
Common stock, no par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized, unlimited	Unlimited	Unlimited
Franklin Bitcoin ETF [Member]
Investment in bitcoin, at cost	$ 426,448,438	$ 313,983,408
Common stock, no par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized, unlimited	Unlimited	Unlimited
Subsequent Event [Member]
Capital shares payable, adjustment for slippage			$ 53
Subsequent Event [Member] \| Franklin Bitcoin ETF [Member]
Capital shares payable, adjustment for slippage			$ 53

Adjustment to capital shares payable arising from settlement of slippage.

No definition available.

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- Definition

Face amount per share of no-par value common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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- Definition

Indicates whether number of common shares permitted to be issued is unlimited. Acceptable value is "Unlimited".

+ References

+ Details

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- Definition

Cost of crypto asset. Excludes crypto asset held for platform user.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

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Period Type:	instant

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