Leases - Lessor (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total lease revenues	$ 11,450	$ 11,543	$ 11,821
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues
Avis
Disaggregation of Revenue [Line Items]
Total lease revenues	$ 6,478	$ 6,609	$ 6,660
Budget
Disaggregation of Revenue [Line Items]
Total lease revenues	4,272	4,220	4,425
Other
Disaggregation of Revenue [Line Items]
Total lease revenues	700	714	736
Americas
Disaggregation of Revenue [Line Items]
Total lease revenues	8,809	8,970	9,261
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total lease revenues	2,025	1,958	1,932
Asia and Australasia
Disaggregation of Revenue [Line Items]
Total lease revenues	$ 616	$ 615	$ 628