Segment Information (Summary Of Segments Information) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 2,432	$ 1,372
Adjusted EBITDA	810	47
Less:
Non-vehicle related depreciation and amortization	60	68
Interest expense	53	61
Early extinguishment of debt	0	129
Restructuring and other related charges	8	20
Transaction-related costs, net	0	1
COVID-19 charges	(7)	18
Unprecedented personal-injury and other legal matters, net	1	0
Net income (loss)	695	(250)
Minimum annual guaranteed rent in excess of concession fees, net	(7)	19
Vehicles damaged in overflow parking lots, net of insurance proceeds	0	(6)
Other charges	0	5
COVID-19 charges	(7)	18
Operating expense
Less:
COVID-19 charges	(7)	17
COVID-19 charges	(7)	17
Selling, general and administrative expenses
Less:
COVID-19 charges	0	1
COVID-19 charges	0	1
COVID-19 Charges
Less:
COVID-19 charges	(7)	18
COVID-19 charges	(7)	18
Statements of Operations | Cloud Based Computing Costs
Less:
COVID-19 charges	2
COVID-19 charges	2
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
Adjusted EBITDA	(23)	(11)
Americas | Geographical
Segment Reporting Information [Line Items]
Revenues	2,000	1,080
Adjusted EBITDA	810	108
International | Geographical
Segment Reporting Information [Line Items]
Revenues	432	292
Adjusted EBITDA	$ 23	$ (50)