Related Party Transactions (Schedule of Equity Method Investment in Balance Sheet and Statements of Comprehensive (Income) Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Other (income) expense, net	$ (2)	$ (3)	$ (13)	$ (6)
Receivables from AMV	19,640		19,640		$ 17,619
Equity method investment in AMV	405		405		422
Vehicles, net investment in lease with AMV	100		100		74
Avis Mobility Ventures LLC (AMV) | Related Party | Avis Mobility Ventures LLC (AMV)
Related Party Transaction [Line Items]
Other (income) expense, net	2	3	13	6
Equity method investment in AMV	23		23		28
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	1	1	9	(1)
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	1	$ 2	4	$ 7
Avis Mobility Ventures LLC (AMV) | Receivables from AMV | Related Party
Related Party Transaction [Line Items]
Receivables from AMV	$ 4		$ 4		$ 3