| Cover Page | Nov. 02, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 2, 2021 |
| Entity Registrant Name | Lyft, Inc. |
| Entity Incorporation, State or 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 |
| Title of 12(b) Security | Class A Common Stock, par value of $0.00001 per share |
| Trading Symbol | LYFT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001759509 |
