Leases - Lessor (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total lease revenues	$ 11,829	$ 9,186	$ 5,243
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues
Avis
Disaggregation of Revenue [Line Items]
Total lease revenues	$ 6,420	$ 4,828	$ 2,851
Budget
Disaggregation of Revenue [Line Items]
Total lease revenues	4,650	3,674	1,878
Other
Disaggregation of Revenue [Line Items]
Total lease revenues	759	684	514
Americas
Disaggregation of Revenue [Line Items]
Total lease revenues	9,401	7,501	3,864
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total lease revenues	1,852	1,343	1,080
Asia and Australasia
Disaggregation of Revenue [Line Items]
Total lease revenues	$ 576	$ 342	$ 299