v3.26.1
COVER - shares
6 Months Ended
Jun. 30, 2026
Aug. 13, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Securities Act File Number 814-01718  
Entity Registrant Name WTI Fund XI, Inc.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 92-1737785  
Entity Address, Address Line One 104 La Mesa Drive  
Entity Address, Address Line Two Suite 102  
Entity Address, City or Town Portola Valley  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94028  
City Area Code 650  
Local Phone Number 234-4300  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   100,000
Entity Central Index Key 0001987731  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2