| Document and Entity Information | Aug. 12, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001321655 |
| Document Type | 8-K/A |
| Document Period End Date | Aug. 12, 2021 |
| Entity Registrant Name | Palantir Technologies Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39540 |
| Entity Tax Identification Number | 68-0551851 |
| Entity Address, Address Line One | 1555 Blake Street |
| Entity Address, Address Line Two | Suite 250 |
| Entity Address, City or Town | Denver |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80202 |
| City Area Code | (720) |
| Local Phone Number | 358-3679 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value $0.001 per share |
| Trading Symbol | PLTR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
