v3.26.1
Document and Entity Information
Mar. 26, 2026
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001885968
Document Type 8-K
Document Period End Date Mar. 25, 2026
Entity Registrant Name T Series Middle Market Loan Fund LLC
Entity Incorporation State Country Code DE
Entity File Number 814-01453
Entity Tax Identification Number 27-0279273
Entity Address, Address Line One 1585 Broadway
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10036
City Area Code 1 (212)
Local Phone Number 761-4000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period true