| Cover | Oct. 29, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 29, 2020 |
| Entity Registrant Name | Twitter, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36164 |
| Entity Tax Identification Number | 20-8913779 |
| Entity Address, Address Line One | 1355 Market Street |
| Entity Address, Address Line Two | Suite 900 |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94103 |
| City Area Code | 415 |
| Local Phone Number | 222-9670 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.000005 per share |
| Trading Symbol | TWTR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001418091 |
| Amendment Flag | false |
