Related Party Transactions - Equity Method Investment in Balance Sheet and Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Vehicles, net	$ 17,619	$ 21,240
Other non-current assets	422	441
Vehicles, net investment in lease	74	31
Other (income) expense, net	(9)	(3)	$ 7
Avis Mobility Ventures LLC (AMV) \| Related Party \| Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other non-current assets	28	24
Other (income) expense, net	9	3	(7)
(Gain) loss on deconsolidation of former subsidiary	0	0	(10)
Avis Mobility Ventures LLC (AMV) \| Receivables From Related Party \| Related Party
Related Party Transaction [Line Items]
Vehicles, net	3	2
Avis Mobility Ventures LLC (AMV) \| Administrative Services \| Related Party \| Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	2	(22)	(7)
Avis Mobility Ventures LLC (AMV) \| Equipment Investment \| Related Party \| Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	$ 7	$ 25	$ 10

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Total carrying value of rental vehicles classified as program assets not otherwise defined in the taxonomy.

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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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