| Cover | Jul. 15, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 15, 2024 |
| Entity File Number | 814-01363 |
| Entity Registrant Name | Kayne Anderson BDC, Inc. |
| Entity Central Index Key | 0001747172 |
| Entity Tax Identification Number | 83-0531326 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 717 Texas Avenue |
| Entity Address, Address Line Two | Suite 2200 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77002 |
| City Area Code | 713 |
| Local Phone Number | 493-2020 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 |
| Trading Symbol | KBDC |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
