| Document And Entity Information | Oct. 22, 2019 |
| Document And Entity Information [Abstract] | |
| Entity Registrant Name | SNAP INC |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0001564408 |
| Document Period End Date | Oct. 22, 2019 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-38017 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 45-5452795 |
| Entity Address, Address Line One | 2772 Donald Douglas Loop North |
| Entity Address, City or Town | Santa Monica |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90405 |
| City Area Code | (310) |
| Local Phone Number | 399-3339 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Class A Common Stock, par value $0.00001 per share |
| Trading Symbol | SNAP |
| Name of each exchange on which registered | NYSE |
