| Document and Entity Information | Dec. 14, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 14, 2020 |
| Entity Registrant Name | ZYNGA INC |
| Entity Central Index Key | 0001439404 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-35375 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 42-1733483 |
| Entity Address, Address Line One | 699 Eighth Street |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94103 |
| City Area Code | 855 |
| Local Phone Number | 449-9642 |
| 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 |
| Trading Symbol(s) | ZNGA |
| Name of each exchange on which registered | NASDAQ |
