| Pay vs Performance Disclosure - USD ($) | | 12 Months Ended | |
| May 30, 2019 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 |
| Pay vs Performance Disclosure [Table] | | | | | |
| Pay vs Performance [Table Text Block] | | Year Summary Compensation Table Total for CEO(1) Compensation Actually Paid to CEO(2) Average Summary Compensation Table Total for Non-CEO NEOs(3) Average Compensation Actually Paid to Non-CEO NEOs(4) Value of Initial Fixed $100 Investment Based On: Net Income (Loss) Total Shareholder Return(5) Peer Group Total Shareholder Return(6) 2022 $ 5,492,603 $ (1,709,637,930) $ 541,996 $ (112,628,126) $ 67.58 $ 108.01 $ (373,705) 2021 $ 4,483,614 $ (894,125,580) $ 891,523 $ (56,560,525) $ 191.68 $ 150.42 $ (520,379) 2020 $ 1,098,513,297 $ 3,868,940,075 $ 86,938,498 $ 316,157,985 $ 247.89 $ 111.81 $ (1,166,391) | | | |
| Named Executive Officers, Footnote [Text Block] | | The dollar amounts in this column are the amounts of total compensation reported for Mr. Karp (our Principal Executive Officer, who we refer to in this disclosure as our “CEO”) for each corresponding year in the “Total” column of the Summary Compensation Table. The dollar amounts in this column represent the average of the amounts reported for our NEOs as a group (excluding Mr. Karp) in the “Total” column of the Summary Compensation Table in each applicable year. The names of each of the NEOs (excluding Mr. Karp) included for purposes of calculating the average amounts in each applicable year are as follows: (i) for 2022, Stephen Cohen, Shyam Sankar, David Glazer, Ryan Taylor, (ii) for 2021, Stephen Cohen, Shyam Sankar, David Glazer, Ryan Taylor; and (iii) for 2020, Stephen Cohen, Shyam Sankar, David Glazer, Ryan Taylor. | | | |
| Peer Group Issuers, Footnote [Text Block] | | The amounts in this column show changes over our past three fiscal years in the value of $100 (assuming reinvestment of dividends), invested in the S&P 500 Information Technology Index. For 2020, this reflects a change starting with the closing price on the day that Palantir’s common stock was first traded on the NYSE, which was September 30, 2020. | | | |
| PEO Total Compensation Amount | | $ 5,492,603 | $ 4,483,614 | $ 1,098,513,297 | |
| PEO Actually Paid Compensation Amount | | $ (1,709,637,930) | (894,125,580) | 3,868,940,075 | |
| Adjustment To PEO Compensation, Footnote [Text Block] | | The dollar amounts in this column represent the amount of “compensation actually paid” to Mr. Karp. The term “compensation actually paid” (“CAP”) does not reflect the amount of compensation actually paid, earned or received by him during the applicable year. Per relevant rules, Mr. Karp’s CAP was calculated by adjusting the Summary Compensation Table Total values for CEO for the applicable year in accordance with the adjustment table below: Year Reported Summary Compensation Table Total for CEO Less: Reported Value of Equity Awards to CEO(a) Add: Equity Award Adjustments to CEO(b) Compensation Actually Paid to CEO 2022 $ 5,492,603 $ 0 $ (1,715,130,533) $ (1,709,637,930) 2021 $ 4,483,614 $ 0 $ (898,609,194) $ (894,125,580) 2020 $ 1,098,513,297 $ 1,094,251,743 $ 3,864,678,521 $ 3,868,940,075 _______________ (a) The amounts in this column reflect the aggregate grant-date fair value reported in the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table for the applicable year for Mr. Karp. (b) The amounts deducted or added in calculating the total equity award adjustments in the above table are as follows: Year Year End Fair Value of Equity Awards Granted in the Year* Year over Year Change in Fair Value of Outstanding and Unvested Equity Awards Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year Value of Dividends or other Earnings Paid on Stock or Option Awards not Otherwise Reflected in Fair Value or Total Compensation Total Equity Award Adjustments 2022 $ 0 $ (1,558,644,915) $ 0 $ (156,485,618) $ 0 $ 0 $ (1,715,130,533) 2021 $ 0 $ (892,150,035) $ 22,283 $ (6,481,442) $ 0 $ 0 $ (898,609,194) 2020 $ 3,763,533,900 $ 86,971,813 $ 0 $ 14,172,808 $ 0 $ 0 $ 3,864,678,521 _______________ * In accordance with the relevant rules, the fair values of unvested and outstanding equity awards to our NEOs (including Mr. Karp) were remeasured as of each vesting date and as of the end of each fiscal year during the years displayed in the table above. For options, the fair values as of each measurement date were determined using the Black-Scholes model, with assumptions and methodologies regarding volatility, dividend yield, and risk-free rates that are generally consistent with those used to estimate fair value at grant under US GAAP. The expected life of options as of each measurement date is estimated based on consideration of consistency with the original valuation assumptions for the grant, the circumstances of the grant at the measurement date, and other relevant factors under US GAAP. The resulting | | | |
| Non-PEO NEO Average Total Compensation Amount | | $ 541,996 | 891,523 | 86,938,498 | |
| Non-PEO NEO Average Compensation Actually Paid Amount | | $ (112,628,126) | (56,560,525) | 316,157,985 | |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | | The dollar amounts in this column represent the average CAP amount to the NEOs as a group (excluding Mr. Karp) determined under the same methodology described in (2) above. Per relevant rules, Average CAPs to Non-CEO NEOs were calculated by adjusting the Summary Compensation Table Total values for the applicable year in accordance with the adjustment table below: Year Average Reported Summary Compensation Table Total for Non-CEO NEOs Less: Average Reported Value of Equity Awards for Non-CEO NEOs(a) Add: Average Equity Award Adjustments for Non-CEO NEOs(b) Average Compensation Actually Paid to Non-CEO NEOs 2022 $ 541,996 $ 0 $ (113,170,122) $ (112,628,126) 2021 $ 891,523 $ 0 $ (57,452,048) $ (56,560,525) 2020 $ 86,938,498 $ 84,309,562 $ 313,529,049 $ 316,157,985 _______________ (a) The amounts in this column reflect the aggregate grant-date fair value reported in the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table for the applicable year for our NEOs as a group (excluding Mr. Karp). (b) The amounts deducted or added in calculating the total equity award adjustments in the above table are as follows: Year Average Year End Fair Value of Equity Awards Granted in the Year Year over Year Average Change in Fair Value of Outstanding and Unvested Equity Awards Average Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year Year over Year Average Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year* Average Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year Average Value of Dividends or other Earnings Paid on Stock or Option Awards not Otherwise Reflected in Fair Value or Total Compensation Total Average Equity Award Adjustments 2022 $ 0 $ (87,619,807) $ 0 $ (25,550,314) $ 0 $ 0 $ (113,170,122) 2021 $ 0 $ (57,633,177) $ 21,282 $ 159,848 $ 0 $ 0 $ (57,452,048) 2020 $ 281,243,796 $ 17,362,574 $ 6,028,288 $ 8,894,391 $ 0 $ 0 $ 313,529,049 _______________ | | | |
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | | CAP and Cumulative TSR | | | |
| Compensation Actually Paid vs. Net Income [Text Block] | | CAP and Net Income (Loss) | | | |
| Tabular List [Table Text Block] | | Tabular List Stock price | | | |
| Total Shareholder Return Amount | | $ 67.58 | 191.68 | 247.89 | |
| Peer Group Total Shareholder Return Amount | | 108.01 | 150.42 | 111.81 | |
| Net Income (Loss) | | $ (373,705,000) | (520,379,000) | (1,166,391,000) | |
| PEO Name | | Mr. Karp | | | |
| Additional 402(v) Disclosure [Text Block] | | The amounts in this column show changes over our past three fiscal years in the value of a hypothetical $100 (assuming reinvestment of dividends, but noting that for the period in question no dividends were paid) invested in Palantir’s common shares traded on the NYSE. For 2020, this reflects a change starting with the closing price on the day that Palantir’s common stock was first traded on the NYSE, which was September 30, 2020.The dollar amounts reported in this column represent the amount of net income (loss) reflected in Palantir’s audited financial statements for the applicable year. | | | |
| Growth Units, Vesting, Service Requirement | 180 days | | | | |
| Measure [Axis]: 1 | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Measure Name | | Stock price | | | |
| PEO [Member] | Equity Awards Reported Value [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | $ 0 | 0 | 1,094,251,743 | |
| PEO [Member] | Equity Award Adjustments [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | (1,715,130,533) | (898,609,194) | 3,864,678,521 | |
| PEO [Member] | Equity Awards Granted During the Year, Unvested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | $ 0 | $ 0 | $ 3,763,533,900 | |
| Equity Awards, Expected Term, Minimum | | 3 years | 6 months | 10 months 24 days | |
| Equity Awards, Expected Term, Maximum | | 10 years 6 months | 11 years | 11 years 7 months 6 days | |
| Equity Awards, Volatility Rate, Minimum | | 71% | | | |
| Equity Awards, Volatility Rate, Maximum | | 71.39% | | | |
| Equity Awards, Risk-Free Rate, Minimum | | 1.12% | 0.04% | 0.10% | |
| Equity Awards, Risk-Free Rate, Maximum | | 4.36% | 1.58% | 1.68% | |
| Equity Awards, Volatility Rate | | | 71% | 71% | |
| Equity Awards, Dividend Yield | | 0% | 0% | 0% | |
| PEO [Member] | Equity Awards Granted In Prior Years, Unvested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | $ (1,558,644,915) | $ (892,150,035) | $ 86,971,813 | |
| PEO [Member] | Equity Awards Granted During the Year, Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | 0 | 22,283 | 0 | |
| PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | (156,485,618) | (6,481,442) | 14,172,808 | |
| PEO [Member] | Equity Awards that Failed to Meet Vesting Conditions [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | 0 | 0 | 0 | |
| PEO [Member] | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | 0 | 0 | 0 | |
| Non-PEO NEO [Member] | Equity Awards Reported Value [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | 0 | 0 | 84,309,562 | |
| Non-PEO NEO [Member] | Equity Award Adjustments [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount | | (113,170,122) | (57,452,048) | 313,529,049 | |
| Non-PEO NEO [Member] | Equity Awards Granted During the Year, Unvested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | 0 | 0 | 281,243,796 | |
| Non-PEO NEO [Member] | Equity Awards Granted In Prior Years, Unvested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | (87,619,807) | (57,633,177) | 17,362,574 | |
| Non-PEO NEO [Member] | Equity Awards Granted During the Year, Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | 0 | 21,282 | 6,028,288 | |
| Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | (25,550,314) | 159,848 | 8,894,391 | |
| Equity Awards, Price Per Share | | | | | $ 4.72 |
| Non-PEO NEO [Member] | Equity Awards that Failed to Meet Vesting Conditions [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | 0 | 0 | 0 | |
| Non-PEO NEO [Member] | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member] | | | | | |
| Pay vs Performance Disclosure [Table] | | | | | |
| Adjustment to Compensation Amount, Equity Awards | | $ 0 | $ 0 | $ 0 | |
