Vehicle Rental Activities - Components Of Vehicle Depreciation And Lease Charges (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Components Of Companys Vehicles [Abstract]
Depreciation expense	$ 1,402	$ 1,330	$ 1,890
Lease charges	156	195	255	$ 195
(Gain) loss on sale of vehicles, net	(361)	(157)	(82)
Vehicle depreciation and lease charges, net	1,197	1,368	2,063
Other accounts payables	142	232	418
Receivables due from former subsidiaries	$ 134	$ 162	$ 576