Segment Information - Summary of Segments Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 11,994	$ 9,313	$ 5,402
Vehicle depreciation and lease charges, net	828	1,197	1,368
Vehicle interest, net	402	313	318
Adjusted EBITDA	4,133	2,411	(175)
Non-vehicle depreciation and amortization	225	272	286
Assets exclusive of assets under vehicle programs	8,499	8,581	8,365
Assets under vehicle programs	17,428	14,019	9,173
Capital expenditures (excluding vehicles)	246	108	94
Americas
Segment Reporting Information [Line Items]
Revenues	9,474	7,557	3,965
Vehicle depreciation and lease charges, net	414	851	968
Vehicle interest, net	348	258	274
Adjusted EBITDA	3,660	2,364	72
Non-vehicle depreciation and amortization	141	178	185
Assets exclusive of assets under vehicle programs	5,798	5,746	5,510
Assets under vehicle programs	14,269	11,437	7,155
Capital expenditures (excluding vehicles)	117	74	65
International
Segment Reporting Information [Line Items]
Revenues	2,520	1,756	1,437
Vehicle depreciation and lease charges, net	414	346	400
Vehicle interest, net	54	55	44
Adjusted EBITDA	560	118	(202)
Non-vehicle depreciation and amortization	66	84	91
Assets exclusive of assets under vehicle programs	2,402	2,716	2,754
Assets under vehicle programs	3,159	2,582	2,018
Capital expenditures (excluding vehicles)	33	26	29
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0	0
Vehicle depreciation and lease charges, net	0	0	0
Vehicle interest, net	0	0	0
Adjusted EBITDA	(87)	(71)	(45)
Non-vehicle depreciation and amortization	18	10	10
Assets exclusive of assets under vehicle programs	299	119	101
Assets under vehicle programs	0	0	0
Capital expenditures (excluding vehicles)	$ 96	$ 8	$ 0