| Cover | Aug. 04, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 04, 2022 |
| Entity File Number | 814-01044 |
| Entity Registrant Name | TriplePoint Venture Growth BDC Corp. |
| Entity Central Index Key | 0001580345 |
| Entity Tax Identification Number | 46-3082016 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | TriplePoint Venture Growth BDC Corp. |
| Entity Address, Address Line Two | 2755 Sand Hill Road |
| Entity Address, Address Line Three | Suite 150 |
| Entity Address, City or Town | Menlo Park |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94025 |
| City Area Code | 650 |
| Local Phone Number | 854-2090 |
| 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 $0.01 per share |
| Trading Symbol | TPVG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
