Class of warrant or right expiration month and year.

No definition available.

Name:	pltr_ClassOfWarrantOrRightExpirationMonthAndYear
Namespace Prefix:	pltr_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Issuance of common stock upon net exercise of common stock warrants shares.

+ References

No definition available.

+ Details

Name:	pltr_IssuanceOfCommonStockUponNetExerciseOfCommonStockWarrantsShares
Namespace Prefix:	pltr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of reduction in number of shares issuable on warrant exercise.

+ References

No definition available.

+ Details

Name:	pltr_PercentageOfReductionInNumberOfSharesIssuableOnWarrantExercise
Namespace Prefix:	pltr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Stock Issued During Period, Shares, New Issues.

+ References

No definition available.

+ Details

Name:	pltr_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	pltr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrants and rights outstanding exercise contingency.

+ References

No definition available.

+ Details

Name:	pltr_WarrantsAndRightsOutstandingExerciseContingency
Namespace Prefix:	pltr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=pltr_SeriesILeadWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=pltr_SeriesILeadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=pltr_VentureThirteenWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=pltr_SeriesILeadOrVentureThirteenWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=pltr_SeriesIIpoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_ConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=pltr_SeriesIConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pltr_TemporaryequitytypeaxisAxis=pltr_SeriesdconvertiblestockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Billions		3 Months Ended	12 Months Ended
	Jan. 31, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Series I Lead Warrants [Member]
Class of Warrant or Right [Line Items]
Class of warrant or right, expiration month and year				2025-01
Common Class B [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding				8,625,420
Common Class B [Member] \| Series I Lead [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding			5,211,093
Exercise price of each warrant			$ 6.13
Common Class B [Member] \| Venture 13 Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding			814,666
Exercise price of each warrant			$ 3.51
Common Class B [Member] \| Series I Lead Or Venture Thirteen Warrants [Member] \| Maximum [Member]
Class of Warrant or Right [Line Items]
Class of warrant or right, expiration month and year			2025-01
Common Class B [Member] \| Series I Lead Or Venture Thirteen Warrants [Member] \| Minimum [Member]
Class of Warrant or Right [Line Items]
Class of warrant or right, expiration month and year			2021-12
Common Class B [Member] \| Series I IPO [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding			13,042,415
Class of warrant or right, expiration month and year			2023-11
Warrants and rights outstanding exercise contingency			$ 12.9
Convertible Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding				21,831,545
Series I Convertible Preferred Stock [Member] \| Series I Lead Warrants [Member]
Class of Warrant or Right [Line Items]
Percentage of reduction in number of shares issuable on warrant exercise	20.00%
Common Stock [Member]
Class of Warrant or Right [Line Items]
Issuance of common stock upon net exercise of common stock warrants shares		7,631,329	7,631,329
Warrants issued to purchase shares		7,632,154
Exercise price of each warrant		$ 0.001
Series D Convertible Stock [Member]
Class of Warrant or Right [Line Items]
Warrants issued to purchase shares		2,586,208
Exercise price of each warrant		$ 0.7406
Stock shares issued during the period share		2,380,034