v3.19.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 30, 2019
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity Registrant Name Lyft, Inc.  
Entity Central Index Key 0001759509  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity File Number 001-38846  
Entity Tax Identification Number 20-8809830  
Entity Address, Address Line One 185 Berry Street  
Entity Address, Address Line Two Suite 5000  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94107  
City Area Code 844  
Local Phone Number 250-2773  
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE  
Title of each class Class A common stock, par value of $0.00001 per share  
Trading Symbol LYFT  
Name of each exchange on which registered NASDAQ  
Class A Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   286,463,787
Class B Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   11,232,629