| Cover | Feb. 23, 2023 | Nov. 10, 2022 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Feb. 23, 2023 | |
| Entity Registrant Name | Barings BDC, Inc. | |
| Entity Incorporation, State or Country Code | MD | |
| Securities Act File Number | 814-00733 | |
| 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 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Entity Central Index Key | 0001379785 | |
| Amendment Flag | false |
