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Cover Page - shares
 3 Months Ended
Mar. 31, 2021
May 03, 2021
Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2021  
Document Transition Report false  
Entity File Number 001-38846  
Entity Registrant Name Lyft, Inc.  
Entity Incorporation, State or Country Code DE  
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  
Title of each class Class A common stock, par value of $0.00001 per share  
Trading Symbol(s) LYFT  
Name of each exchange on which registered NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001759509  
Current Fiscal Year End Date --12-31  
Class A Common Stock    
Entity Information    
Entity Common Stock, Shares Outstanding   320,569,503
Class B Common Stock    
Entity Information    
Entity Common Stock, Shares Outstanding   8,802,629