Leases (Schedule of Revenues Disaggregated by Geography) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Lessor, Lease, Description [Line Items]
Total lease revenues	$ 2,989	$ 2,994	$ 5,374	$ 5,503
Avis
Lessor, Lease, Description [Line Items]
Total lease revenues	1,687	1,710	3,032	3,144
Budget
Lessor, Lease, Description [Line Items]
Total lease revenues	1,120	1,105	1,994	2,014
Other
Lessor, Lease, Description [Line Items]
Total lease revenues	182	179	348	345
Americas
Lessor, Lease, Description [Line Items]
Total lease revenues	2,308	2,330	4,193	4,304
Europe, Middle East and Africa
Lessor, Lease, Description [Line Items]
Total lease revenues	543	524	885	888
Asia and Australasia
Lessor, Lease, Description [Line Items]
Total lease revenues	$ 138	$ 140	$ 296	$ 311