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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2025
Purchase Commitment |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |
Long-term purchase commitment, amount | $ 1,950.0 |
Period for purchase price commitment (in years) | 10 years |
Purchase Commitment, Contract Year Oct 1 2024 - Sep 30 2025 |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |
Purchase commitment satisfied |  | $ 160.2
Purchase commitment for current contract year |  | 160.2
Purchase Commitment, Contract Year Oct 1 2025 - Sep 30 2026 |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |
Purchase commitment for current contract year |  | $ 170.2

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- Definition Purchase Commitment For Current Contract Year + References No definition available. + Details
Name: | pltr_PurchaseCommitmentForCurrentContractYear
Namespace Prefix: | pltr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Purchase Commitment Satisfied + References No definition available. + Details
Name: | pltr_PurchaseCommitmentSatisfied
Namespace Prefix: | pltr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=us-gaap_PurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=pltr_PurchaseCommitmentContractYearOct12024Sep302025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=pltr_PurchaseCommitmentContractYearOct12025Sep302026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |