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Goodwill and Intangible Assets, Net - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) dealership	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Business Combination [Line Items]
Goodwill	$ 3		$ 3		$ 0
Amortization expense	3	$ 4	$ 12	$ 13
Acquired finite-lived intangible assets, weighted average useful life			2 years 4 months 24 days
Franchise Dealership
Business Combination [Line Items]
Number of franchise dealership acquired | dealership			2
Consideration transferred			$ 51
Payments to acquire assets			27
Consideration transferred, liabilities incurred			24
Net tangible assets	36		36
Indefinite-lived assets	12		12
Goodwill	$ 3		$ 3

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