Related Party Transactions - Equity Method Investment in Balance Sheet and Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Other (income) expense, net	$ (6)	$ (1)
Receivables from AMV	17,522		$ 17,619
Equity method investment in AMV	410		422
Vehicles, net investment in lease with AMV	80		74
Avis Mobility Ventures LLC (AMV) | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	6	1
Equity method investment in AMV	26		28
Avis Mobility Ventures LLC (AMV) | Administrative Services | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	4	(2)
Avis Mobility Ventures LLC (AMV) | Equipment Investment | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	2	$ 3
Avis Mobility Ventures LLC (AMV) | Receivables from AMV | Related Party
Related Party Transaction [Line Items]
Receivables from AMV	$ 3		$ 3