Document and Entity Information
| Document and Entity Information Document | Oct. 22, 2020 |
| Cover [Abstract] | |
| Local Phone Number | 948-3200 |
| Document Type | 8-K |
| Entity Registrant Name | VERISIGN INC/CA |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $0.001 Par Value Per Share |
| Pre-commencement Issuer Tender Offer | false |
| Pre-commencement Tender Offer | false |
| Soliciting Material | false |
| Written Communications | false |
| Entity Address, Address Line One | 12061 Bluemont Way, |
| Entity File Number | 000-23593 |
| Entity Tax Identification Number | 94-3221585 |
| Entity Address, City or Town | Reston, |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 20190 |
| Trading Symbol | VRSN |
| Entity Central Index Key | 0001014473 |
| Amendment Flag | false |
| Security Exchange Name | NASDAQ |
| Document Period End Date | Oct. 22, 2020 |
| Entity Incorporation, State or Country Code | DE |
| City Area Code | 703 |