Related Party Transactions - Schedule of Equity Method Investment in Balance Sheet and Statements of Comprehensive (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Other (income) expense, net	$ (6)	$ (6)
Receivables from AMV	18,093		$ 18,720
Equity method investment in AMV	382		403
Vehicles, net investment in lease with AMV	146		136
Avis Mobility Ventures LLC (AMV) | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	6	6
Equity method investment in AMV	27		30
Avis Mobility Ventures LLC (AMV) | (Income) expense for services to AMV, net | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	4	4
Avis Mobility Ventures LLC (AMV) | (Income) loss on equity method investment in AMV, net | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	2	$ 2
Avis Mobility Ventures LLC (AMV) | Receivables from AMV | Related Party
Related Party Transaction [Line Items]
Receivables from AMV	$ 6		$ 6