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Cover Page - USD ($)
 5 Months Ended
Dec. 31, 2024
Feb. 24, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Document Period End Date Dec. 31, 2024    
Document Annual Report true    
Document Transition Report false    
Transition Report true    
Current Fiscal Year End Date --12-31    
Entity Registrant Name Grayscale Bitcoin Mini Trust ETF    
Entity Central Index Key 0002015034    
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 Filer Category Non-accelerated Filer    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity File Number 001-42184    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 99-6447880    
Entity Address, Address Line One 290 Harbor Drive, 4th Floor    
City Area Code 212    
Local Phone Number 668-1427    
Entity Address, City or Town Stamford    
Entity Address, Postal Zip Code 06902    
Entity Address, State or Province CT    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   93,759,963  
Title of 12(b) Security Grayscale Bitcoin Mini Trust ETF Shares    
Trading Symbol BTC    
Security Exchange Name NYSEArca    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE: None

    
Auditor Name KPMG LLP    
Auditor Location New York, New York    
Auditor Firm ID 185