Basis of Presentation - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 2,530	$ 2,430
Avis
Disaggregation of Revenue [Line Items]
Revenues	1,428	1,372
Budget
Disaggregation of Revenue [Line Items]
Revenues	952	885
Other
Disaggregation of Revenue [Line Items]
Revenues	150	173
Americas
Disaggregation of Revenue [Line Items]
Revenues	1,962	1,907
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	375	361
Asia and Australasia
Disaggregation of Revenue [Line Items]
Revenues	$ 193	$ 162