| Cover | Aug. 09, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 09, 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 |
