Commitments and Contingencies (Details) $ in Millions	1 Months Ended		3 Months Ended
	Oct. 31, 2023 classAction	Jun. 30, 2023 USD ($) defendant	Mar. 31, 2025 USD ($) classAction	Mar. 31, 2024 USD ($)	Mar. 31, 2023
Schedule Of Commitments And Contingencies [Line Items]
Number of class actions | classAction	2
Number of class actions seeking damages | classAction			1
Range of possible loss (up to)			$ 40
Purchase obligation over the next twelve months			$ 7,500
Long-term purchase commitment, term			12 months
Purchase commitment period decrease			$ (1,200)
Other receivables			231	$ 239
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]
Other receivables			40
Wyndham
Schedule Of Commitments And Contingencies [Line Items]
Other receivables			$ 24
Tax Liability | Real Estate Inc
Schedule Of Commitments And Contingencies [Line Items]
Liability assumed, percent					62.50%
Tax Liability | Wyndham Hotels And Resorts Inc And Travel + Leisure Co.
Schedule Of Commitments And Contingencies [Line Items]
Liability assumed, percent					37.50%