Segment Information - Summary of Geographic Segment Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 9,313	$ 5,402	$ 9,172
Assets exclusive of assets under vehicle programs	8,581	8,365	9,311
Assets under vehicle programs	14,019	9,173	13,815
Net long-lived assets	2,369	2,568	2,691
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	7,254	3,758	5,867
Assets exclusive of assets under vehicle programs	5,575	5,262	5,830
Assets under vehicle programs	10,915	6,797	9,824
Net long-lived assets	1,328	1,421	1,536
All Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,059	1,644	3,305
Assets exclusive of assets under vehicle programs	3,006	3,103	3,481
Assets under vehicle programs	3,104	2,376	3,991
Net long-lived assets	$ 1,041	$ 1,147	$ 1,155