Related Party Transactions - Equity Method Investment in Balance Sheet and Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Receivables from AMV	$ 21,352		$ 21,352		$ 21,240
Equity method investment in AMV	421		421		441
Vehicles, net investment in lease with AMV	99		99		31
Other (income) expense, net	(3)	$ (1)	(6)	$ (3)
Avis Mobility Ventures LLC (AMV) | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Equity method investment in AMV	29		29		24
Other (income) expense, net	3	1	6	3
Avis Mobility Ventures LLC (AMV) | Receivables From Related Party | Related Party
Related Party Transaction [Line Items]
Receivables from AMV	2		2		$ 2
Avis Mobility Ventures LLC (AMV) | Administrative Services | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	1	(6)	(1)	(20)
Avis Mobility Ventures LLC (AMV) | Equipment Investment | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	$ 2	$ 7	$ 7	$ 23