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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

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Namespace Prefix:	pins_
Data Type:	num:areaItemType
Balance Type:	na
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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

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Namespace Prefix:	pins_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant