Commitments And Contingencies (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) classAction employee	Jun. 30, 2023 subsidiary employee vehicle	Mar. 31, 2023	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, liability assumed, percent			37.50%
Number of class action | classAction	2
Number of class action seeking damages in connection with breach of contract | employee	1
Number of subsidiaries names as a defendant | subsidiary		2
Number of employees involved in an accident | employee		1
Number of vehicles involved in an accident | vehicle		1
Range of possible loss (up to)	$ 40
Purchase obligation over the next twelve months	$ 6,800
Long-term purchase commitment, period	12 months
Aggregate purchase obligations	$ 149
Receivables due from former subsidiaries	237			$ 212	$ 134
Liabilities accrued for asset retirement obligations	27			$ 26
Realogy
Schedule Of Commitments And Contingencies [Line Items]
Receivables due from former subsidiaries	38
Wyndham
Schedule Of Commitments And Contingencies [Line Items]
Receivables due from former subsidiaries	$ 23
Tax Liability | Wyndham
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, liability assumed, percent			62.50%