Segment Information - Reconciliation of Adjusted EBITDA to Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 4,133	$ 2,411	$ (175)
Less:
Non Vehicle Related Depreciation And Amortization, Excluding Cloud Computing Expense	235	279	286
Interest expense related to corporate debt, net
Interest expense	250	218	231
Early extinguishment of debt	0	136	9
Covid-19 charges	(9)	(2)	122
Restructuring and other related charges	19	64	118
Non-operational charges related to shareholder activist activity	0	3	8
Unprecedented personal-injury and other legal matters, net	1	0	4
Transaction-related costs, net	8	5	3
Other (income) expense, net	(7)	0	0
Income (loss) before income taxes	3,636	1,708	(956)
Minimum annual guaranteed rent in excess of concession fees, net	(9)	(2)	60
Vehicles damaged in overflow parking lots, net of insurance proceeds	0	(7)
Other charges	0	7
Covid-19 charges	(9)	(2)	122
Operating Expense
Interest expense related to corporate debt, net
Covid-19 charges	(9)	(3)
Covid-19 charges	(9)	(3)
Operating Expense | Cloud Computing Costs
Less:
Non-vehicle depreciation and amortization	10	7
Selling, General and Administrative Expenses
Interest expense related to corporate debt, net
Covid-19 charges	0	1
Covid-19 charges	0	1
COVID-19 Charges
Interest expense related to corporate debt, net
Covid-19 charges	(9)	(2)
Covid-19 charges	(9)	(2)
Acquisition-related Costs
Less:
Non-vehicle depreciation and amortization	$ 43	$ 66	$ 66