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Discontinued Operations - Major Line Items Included in Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating expenses:
Net loss from discontinued operations	$ (2)	$ (347)	$ (13)	$ (363)
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]
Revenue	23	1,187	4,249	2,668
Cost of revenue	24	1,414	4,023	2,751
Gross profit (loss)	(1)	(227)	226	(83)
Operating expenses:
Sales and marketing	1	90	153	189
Technology and development	0	10	6	41
General and administrative	0	10	10	26
Restructuring costs	0	0	25	0
Total operating expenses	1	110	194	256
Income (loss) from discontinued operations	(2)	(337)	32	(339)
Loss on extinguishment of debt	0	0	(21)	0
Other income	0	0	13	0
Interest expense	0	(16)	(36)	(25)
Loss from discontinued operations before income taxes	(2)	(353)	(12)	(364)
Income tax benefit (expense)	0	6	(1)	1
Net loss from discontinued operations	$ (2)	$ (347)	$ (13)	$ (363)
Net loss from discontinued operations per share:
Basic (usd per share)	$ (0.01)	$ (1.37)	$ (0.05)	$ (1.46)
Diluted (usd per share)	$ (0.01)	$ (1.31)	$ (0.05)	$ (1.38)

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