| Document and Entity Information | Sep. 03, 2019 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001617640 |
| Document Type | 8-K |
| Document Period End Date | Sep. 3, 2019 |
| Entity Registrant Name | ZILLOW GROUP, INC. |
| Entity Incorporation State Country Code | WA |
| Entity File Number | 001-36853 |
| Entity Tax Identification Number | 47-1645716 |
| Entity Address, Address Line One | 1301 Second Avenue |
| Entity Address, Address Line Two | Floor 31 |
| Entity Address, City or Town | Seattle |
| Entity Address, State or Province | WA |
| Entity Address, Postal Zip Code | 98101 |
| City Area Code | (206) |
| Local Phone Number | 470-7000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Class A [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | ZG |
| Security Exchange Name | NASDAQ |
| Common Class C [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class C Capital Stock, par value $0.0001 per share |
| Trading Symbol | Z |
| Security Exchange Name | NASDAQ |
