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Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 14, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 000-55429  
Entity Registrant Name Terra Income Fund 6, LLC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 92-0548263  
Entity Address, Address Line One 205 West 28th Street,  
Entity Address, Address Line Two 12th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10001  
City Area Code 212  
Local Phone Number 753-5100  
Title of 12(b) Security 7.00% Notes due 2026  
Trading Symbol TFSA  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   0
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001577134  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false