v3.26.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2026
Jul. 30, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Document Period End Date Jun. 30, 2026  
Document Quarterly Report true  
Document Transition Report false  
Current Fiscal Year End Date --12-31  
Entity Registrant Name Grayscale Stellar Lumens Trust (XLM)  
Entity Central Index Key 0001761325  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Common Stock, Shares Outstanding   1,419,000
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Securities Act File Number 000-56434  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 83-6545098  
Entity Address, Address Line One c/o Grayscale Investments Sponsors, 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  
Title of 12(g) Security Grayscale Stellar Lumens Trust (XLM) Shares  
Trading Symbol GXLM