| N-2 | Mar. 01, 2024 |
| Cover [Abstract] | |
| Entity Central Index Key | 0001816389 |
| Amendment Flag | false |
| Document Type | 424B3 |
| Entity Registrant Name | BLACKROCK PRIVATE INVESTMENTS FUND |
| General Description of Registrant [Abstract] | |
| Risk Factors [Table Text Block] | In the sections of the Prospectus entitled “Prospectus Summary—Principal Risk Considerations—Limited Operating History” and “Risks—Limited Operating History,” the first sentence of each such risk factor is deleted in its entirety and replaced with the following: The Fund is a diversified, closed-end The sections of the Prospectus entitled “Prospectus Summary—Principal Risk Considerations—Non-Diversified “Risks—Non-Diversified |
