Commitments and Contingencies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) employee	Mar. 31, 2023	Jun. 30, 2022 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Range of possible loss (up to)	$ 35
Purchase obligation over the next twelve months	$ 5,600
Long-term purchase commitment, term	12 months
Purchase commitment period increase	$ 1,100
Other receivables	$ 140		$ 74
Breach of Contract | Jose Mendez v Avis Budget Group Inc
Schedule Of Commitments And Contingencies [Line Items]
Number of claims filed | employee	3
Fines And Fees Charged To Renters | Jose Mendez v Avis Budget Group Inc
Schedule Of Commitments And Contingencies [Line Items]
Number of claims filed | employee	1
Real Estate Inc | Tax Liability
Schedule Of Commitments And Contingencies [Line Items]
Liability assumed, percent		62.50%
Wyndham Hotels And Resorts Inc And Travel + Leisure Co. | Tax Liability
Schedule Of Commitments And Contingencies [Line Items]
Liability assumed, percent		37.50%
Realogy
Schedule Of Commitments And Contingencies [Line Items]
Other receivables	$ 36
Wyndham
Schedule Of Commitments And Contingencies [Line Items]
Other receivables	$ 22