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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating expenses:
Net loss from discontinued operations	$ 0	$ (2)	$ 0	$ (13)
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		4,249
Cost of revenue		24		4,023
Gross profit (loss)		(1)		226
Operating expenses:
Sales and marketing		1		153
Technology and development		0		6
General and administrative		0		10
Restructuring costs		0		25
Total operating expenses		1		194
Income (loss) from discontinued operations		(2)		32
Loss on extinguishment of debt		0		(21)
Other income		0		13
Interest expense		0		(36)
Loss from discontinued operations before income taxes		(2)		(12)
Income tax expense		0		(1)
Net loss from discontinued operations		$ (2)		$ (13)
Net loss from discontinued operations per share:
Basic (usd per share)		$ (0.01)		$ (0.05)
Diluted (usd per share)		$ (0.01)		$ (0.05)

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