Subsequent Events (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Oct. 31, 2023	Jun. 30, 2023	Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Subsequent Event [Line Items]
Asset acquisition, consideration transferred		$ 14
Number of shares purchased (in shares)						2,900
Cost of shares repurchased during the period			$ 491	[1]	$ 868	$ 637	[1]	$ 2,576
SRS Mobility Ventures, LLC | Avis Mobility Ventures LLC (AMV)
Subsequent Event [Line Items]
Ownership acquired percentage			40.00%			40.00%
Fleet
Subsequent Event [Line Items]
Property acquired		$ 20
Subsequent Event
Subsequent Event [Line Items]
Number of shares purchased (in shares)	665
Cost of shares repurchased during the period	$ 114
Subsequent Event | Licensee In North America
Subsequent Event [Line Items]
Asset acquisition, consideration transferred	$ 10
Subsequent Event | SRS Mobility Ventures, LLC | Avis Mobility Ventures LLC (AMV)
Subsequent Event [Line Items]
Ownership acquired percentage	34.00%
Subsequent Event | Fleet | Licensee In North America
Subsequent Event [Line Items]
Property acquired	$ 4

[1] Amount includes excise taxes due under the Inflation Reduction Act of 2022.