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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Income Tax [Line Items]
Income tax benefit (expense)	$ (3,000,000)	$ 1,000,000	$ 8,000,000
Income tax reconciliation change in deferred tax assets valuation allowance	97,000,000	274,000,000
Effective income tax rate reconciliation, state and local income taxes, amount		2,000,000
Impairment and restructuring costs	0	57,000,000	77,000,000
Unrecognized tax benefits	90,000,000	75,000,000	49,000,000	$ 40,000,000
Research And Development
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards	164,000,000	133,000,000
Federal
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards	1,800,000,000	2,100,000,000
State
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards	63,000,000	73,000,000
Trulia
Schedule Of Income Tax [Line Items]
Income tax benefit (expense)			10,000,000
Trulia | Trade names and trademarks
Schedule Of Income Tax [Line Items]
Impairment and restructuring costs	$ 0	0	$ 72,000,000
ShowingTime.com, Inc.
Schedule Of Income Tax [Line Items]
Income tax reconciliation change in deferred tax assets valuation allowance		$ (3,000,000)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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