| Document and Entity Information | Dec. 02, 2019 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001418091 |
| Document Type | 8-K |
| Document Period End Date | Dec. 2, 2019 |
| Entity Registrant Name | Twitter, Inc. |
| Entity Incorporation State 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 |
| Security 12b Title | Common Stock, par value $0.000005 per share |
| Trading Symbol | TWTR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
