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Commitments and Contingencies (Details) ft² in Thousands, $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) ft²
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Area of office space (in sqft) | ft² |  |  |  | 490
One-time payment for lease termination | $ 89.5 |  |  |
Noncancelable minimum lease payments not yet commenced |  |  |  | $ 440.0
Secured letters of credit outstanding |  | $ 8.1 | $ 25.5 |

X
- Definition Lessee, Area Of Property + References No definition available. + Details
Name: | pins_LesseeAreaOfProperty
Namespace Prefix: | pins_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Lessee, Lease Not Yet Commenced, Undiscounted Amount + References No definition available. + Details
Name: | pins_LesseeLeaseNotYetCommencedUndiscountedAmount
Namespace Prefix: | pins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Operating Lease, Payments For Lease Termination + References No definition available. + Details
Name: | pins_OperatingLeasePaymentsForLeaseTermination
Namespace Prefix: | pins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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