COVER - shares	9 Months Ended
	Sep. 30, 2022	Nov. 07, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	814-00995
Entity Registrant Name	Carlyle Secured Lending, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	80-0789789
Entity Address, Address Line One	One Vanderbilt Avenue,
Entity Address, Address Line Two	Suite 3400,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	(212)
Local Phone Number	813-4900
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	CGBD
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		51,363,799
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001544206
Amendment Flag	false