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Cover Page - shares
 9 Months Ended
Sep. 30, 2020
Oct. 23, 2020
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2020  
Document Transition Report false  
Entity File Number 001-38872  
Entity Registrant Name Pinterest, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-3607129  
Entity Address, Address Line One 505 Brannan Street  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94107  
City Area Code 415  
Local Phone Number 762-7100  
Title of 12(b) Security Class A Common Stock, $0.00001 par value  
Trading Symbol PINS  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001506293  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   510,856,241
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   107,214,170