Segment Information - Reconciliation of Adjusted EBITDA to Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 2,490	$ 4,133	$ 2,411
Less:
Non-vehicle related depreciation and amortization	216	225	272
Interest expense	296	250	218
Early extinguishment of debt costs	5	0	136
Restructuring and other related charges	11	19	64
Transaction-related costs, net	5	8	5
Other (income) expense, net	3	(7)	0
COVID-19 charges	0	(9)	(2)
Legal matters, net	5	1	3
Income before income taxes	1,914	3,636	1,708
Operating Expense | Cloud computing costs
Less:
Cloud computing costs	$ 35	$ 10	$ 7