v3.25.1
Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2025
Apr. 30, 2025
Document Information [Line Items]    
Entity Central Index Key 0001980994  
Entity Registrant Name iShares Bitcoin Trust ETF  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2025  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   1,063,000,000