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Discontinued Operations - Non-Cash Items and Capital Expenditures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property and equipment purchased on account			$ 2	$ 2
Issuance (settlement) of beneficial interests in securitizations			(79)	25
Discontinued Operations, 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]
Amortization of debt discount and debt issuance costs			21	1
Loss on extinguishment of debt	$ 0	$ 0	21	0
Share-based compensation			16	27
Inventory valuation adjustment			9	304
Depreciation and amortization			7	7
Property and equipment purchased on account			1	6
Issuance (settlement) of beneficial interests in securitizations			$ (79)	$ 25

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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