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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

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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

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No definition available.

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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.

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No definition available.

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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.

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No definition available.

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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.

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No definition available.

+ Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=pltr_PurchaseCommitmentContractYearOct12025Sep302026Member
Namespace Prefix:
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