Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill				$ 1,071	$ 1,099	$ 1,070
Asset acquisition, consideration transferred	$ 10		$ 14
McNicoll Vehicle Hire
Business Acquisition [Line Items]
Business combination, consideration transferred		$ 17
Goodwill		10		$ 2
Trade Names | McNicoll Vehicle Hire
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 4
Acquired finite-lived intangible assets, weighted average useful life		10 years
Customer relationships | McNicoll Vehicle Hire
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 1
Acquired finite-lived intangible assets, weighted average useful life		10 years
Franchise Rights
Business Acquisition [Line Items]
Finite-lived intangible assets acquired			$ 14
Acquired finite-lived intangible assets, weighted average useful life			5 years
License agreements
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 10
Acquired finite-lived intangible assets, weighted average useful life	3 years
Vehicle leases
Business Acquisition [Line Items]
Reportable segment Adjusted EBITDA	$ 4		$ 20