Segment Information - Summary of Geographic Segment Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 12,008	$ 11,994	$ 9,313
Assets exclusive of assets under vehicle programs	9,590	8,499	8,581
Assets under vehicle programs	22,979	17,428	14,019
Net long-lived assets	2,488	2,330	2,369
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	8,775	8,975	7,254
Assets exclusive of assets under vehicle programs	6,460	5,622	5,575
Assets under vehicle programs	18,228	13,514	10,915
Net long-lived assets	1,507	1,386	1,328
All Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,233	3,019	2,059
Assets exclusive of assets under vehicle programs	3,130	2,877	3,006
Assets under vehicle programs	4,751	3,914	3,104
Net long-lived assets	$ 981	$ 944	$ 1,041