Cover - shares	9 Months Ended
	Sep. 30, 2022	Nov. 10, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Securities Act File Number	814-00733
Entity Registrant Name	Barings BDC, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	06-1798488
Entity Address, Address Line One	300 South Tryon Street,
Entity Address, Address Line Two	Suite 2500
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202
City Area Code	704
Local Phone Number	805-7200
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	BBDC
Security Exchange Name	NYSE
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		108,831,838
Entity Central Index Key	0001379785
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3