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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disposal Group, Disposed of By Means Other Than Sale, Wind-Down | Zillow Offers Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	$ 85	$ 482
Cumulative amount recognized	567
Employee termination costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative amount recognized		10
Employee termination costs | Zillow Offers Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative amount recognized	33
Employee termination costs | Disposal Group, Disposed of By Means Other Than Sale, Wind-Down | Zillow Offers Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	20	$ 52
Cumulative amount recognized	72
Employee termination costs | IMT Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	12
Employee termination costs | Homes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	4
Employee termination costs | Mortgages
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	$ 8

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