Document And Entity Information - USD ($) $ in Thousands	7 Months Ended
	Dec. 31, 2023	Feb. 29, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0001980994
Entity Registrant Name	iShares Bitcoin Trust
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-41914
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	93-6461129
Entity Address, Address Line One	400 Howard Street
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	670-2000
Title of 12(b) Security	Shares
Trading Symbol	IBIT
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		266,000,000
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Philadelphia, Pennsylvania