T Series Middle Market Loan Fund 10-K10 Mar 232022 FY Annual reportFinancial data

Company Profile

Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2022	Mar. 10, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	814-01453
Entity Registrant Name	T Series Middle Market Loan Fund LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	87-3271290
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	212
Local Phone Number	761-4000
Title of 12(b) Security	None
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float		$ 0
Entity Common Stock, Shares Outstanding		31,967,458
Entity Central Index Key	0001885968
Amendment Flag	false
No Trading Symbol Flag	true
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022