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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |
Letter of credit outstanding amount |  | $ 56.8 |  | $ 76.2
Investment Commitments | Investment Agreement |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of shares committed to purchase |  | 3,500,000 |  |
Aggregate purchase price commitment |  | $ 35.0 |  |
Purchase Commitment One |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Long-term purchase commitment, amount | $ 1,490.0 |  |  |
Purchase commitment satisfied |  | $ 157.3 |  |
Purchase commitment for current contract year |  |  | $ 167.0 |
Period for purchase price commitment (in years) | 6 years |  |  |
Purchase Commitment One | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase commitment relief amount | $ 30.0 |  |  |
Period for purchase price commitment (in years) | 3 years |  |  |
Purchase Commitment One | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Purchase commitment relief amount | $ 50.0 |  |  |

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- Definition Investment purchase price commitment. + References No definition available. + Details
Name: | pltr_InvestmentPurchasePriceCommitment
Namespace Prefix: | pltr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Long-term Purchase Commitment, Relief Amount + References No definition available. + Details
Name: | pltr_LongTermPurchaseCommitmentReliefAmount
Namespace Prefix: | pltr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of shares committed to purchase. + References No definition available. + Details
Name: | pltr_NumberOfSharesCommittedToPurchase
Namespace Prefix: | pltr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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 total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=pltr_InvestmentCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=pltr_InvestmentAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
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Balance Type: |
Period Type: |