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Share-Based Awards - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 03, 2022 USD ($) employee $ / shares shares | Jun. 09, 2020 shares | Aug. 08, 2019 shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | shares |  | 12,000,000 |  |  |  |
Unrecognized compensation cost expected recognition period |  |  |  | 2 years 6 months |  |
Zillow Group, Inc. 2020 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Increase in number of shares of common and capital stock available for issuance, percentage |  | 5.00% |  |  |  |
Exercise price per share fixed |  | 100.00% |  |  |  |
2019 Equity Inducement Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | shares |  |  | 10,000,000 |  |  |
Exercise price per share fixed |  |  | 100.00% |  |  |
Option awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, exercise price (USD per share) | $ / shares | $ 38.78 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, plan modification, grants in period, weighted average grant date fair value (USD per share) | $ / shares | $ 67.58 |  |  |  |  |
Share-based payment arrangement, plan modification, number of awards impacted | shares | 7,000,000 |  |  |  |  |
Share-based payment arrangement, plan modification, number of grantees affected | employee | 3,348 |  |  |  |  |
Share-based payment arrangement, plan modification, expected incremental cost | $ 66 |  |  |  |  |
Share-based payment arrangement, plan modification, incremental cost | $ 33 |  |  |  |  |
Unrecognized cost of unvested share-based compensation awards |  |  |  | $ 409 |  |
Total intrinsic value of shares |  |  |  | 13 | $ 310 | $ 564
Fair value of options |  |  |  | $ 226 | 173 | 85
Option awards | Zillow Group, Inc. 2020 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation arrangement by share based payment, award maximum exercisable period |  |  |  | 12 months |  |
Expiration period |  |  |  | 10 years |  |
Vesting period |  |  |  | 4 years |  |
Option awards | 2019 Equity Inducement Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation arrangement by share based payment, award maximum exercisable period |  |  |  | 12 months |  |
Expiration period |  |  |  | 10 years |  |
Share based compensation arrangement by share based payment, award minimum exercisable period |  |  |  | 3 months |  |
Vesting percentage |  |  |  | 25.00% |  |
Option awards | 2019 Equity Inducement Plan | Vesting, Option One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 12 months |  |
Option awards | 2019 Equity Inducement Plan | Vesting, Option Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Unvested restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost expected recognition period |  |  |  | 2 years 6 months |  |
Total fair value of awards vested |  |  |  | $ 247 | $ 152 | $ 125
Total unrecognized compensation cost |  |  |  | $ 470 |  |
Unvested restricted stock units | Zillow Group, Inc. 2020 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |
Unvested restricted stock units | 2019 Equity Inducement Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 25.00% |  |
Unvested restricted stock units | 2019 Equity Inducement Plan | Vesting, Option One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 12 months |  |
Unvested restricted stock units | 2019 Equity Inducement Plan | Vesting, Option Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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