| Document and Entity Information | Apr. 29, 2020 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001759509 |
| Document Type | 8-K/A |
| Document Period End Date | Apr. 29, 2020 |
| Entity Registrant Name | Lyft, Inc. |
| Entity Incorporation State Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value of $0.00001 per share |
| Trading Symbol | LYFT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Description | This Current Report on Form 8-K/A (this “Current Report”) amends the Current Report on Form 8-K filed by Lyft, Inc. (the “Company”) with the Securities and Exchange Commission (the “SEC”) on April 29, 2020 (the “Original Report”) and is being filed in order to amend and supplement the Company’s disclosure under Item 2.05 of the Original Report. The Original Report otherwise remains unchanged. |
