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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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