Commitments And Contingencies (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2023 defendant employee vehicle	Dec. 31, 2024 USD ($) classAction	Dec. 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2023	Dec. 31, 2022 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Number of class action | classAction		2
Number of class action seeking damages in connection with breach of contract | classAction		1
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			$ 6,300
Long-term purchase commitment, period			12 months
Aggregate purchase obligations		145
Receivables due from former subsidiaries		287	$ 237			$ 212
Liabilities accrued for asset retirement obligations		25	$ 27
Purchase commitment period decrease		500
Cause No. CC-23-03188-E | Pending Litigation
Schedule Of Commitments And Contingencies [Line Items]
Number of defendants | defendant	2
Estimate possible loss (in excess of)				$ 1
Realogy
Schedule Of Commitments And Contingencies [Line Items]
Receivables due from former subsidiaries		39
Wyndham
Schedule Of Commitments And Contingencies [Line Items]
Receivables due from former subsidiaries		$ 24
Tax Liability | Real Estate Inc
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, liability assumed, percent					62.50%
Tax Liability | Wyndham Hotels And Resorts Inc And Travel + Leisure Co.
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, liability assumed, percent					37.50%