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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Feb. 19, 2024
Jun. 30, 2023
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Fiscal Year Focus 2023      
Document Fiscal Period Focus FY      
Document Period End Date Dec. 31, 2023      
Document Annual Report true      
Document Transition Report false      
Current Fiscal Year End Date --12-31      
Entity Registrant Name Grayscale Bitcoin Trust (BTC)      
Entity Central Index Key 0001588489      
Entity Small Business false      
Entity Emerging Growth Company false      
Entity Shell Company false      
Entity Filer Category Large Accelerated Filer      
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
Entity File Number 001-41906      
Entity Incorporation, State or Country Code DE      
Entity Tax Identification Number 46-7019388      
Entity Address, Address Line One c/o Grayscale Investments, LLC      
Entity Address, Address Line Two 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       $ 12,594,401,855
ICFR Auditor Attestation Flag true      
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No      
Entity Common Stock, Shares Outstanding     510,710,100  
Auditor Name Marcum LLP Friedman LLP    
Auditor Firm ID 688 711    
Auditor Location New York New York    
Document Financial Statement Error Correction [Flag] false      
Title of 12(b) Security Grayscale Bitcoin Trust (BTC) Shares      
Trading Symbol GBTC      
Security Exchange Name NYSEArca