| Cover | Feb. 10, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 10, 2021 |
| Entity Registrant Name | ZILLOW GROUP, INC. |
| Amendment Flag | false |
| Entity Central Index Key | 0001617640 |
| Entity Incorporation, State or 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 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | ZG |
| Security Exchange Name | NASDAQ |
| Common Class C | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class C Capital Stock, par value $0.0001 per share |
| Trading Symbol | Z |
| Security Exchange Name | NASDAQ |
