Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Unrecognized tax benefits	$ 63	$ 53	$ 58	$ 57
Accrued interest payable on potential tax liabilities	44	31
Current Income Taxes Payable
Income Taxes [Line Items]
Unrecognized tax benefits	17	0
Noncurrent Income Taxes Payable
Income Taxes [Line Items]
Unrecognized tax benefits	21	33
Non Avis Budget Car Rental Tax Contingencies
Income Taxes [Line Items]
Unrecognized tax benefits	$ 17	$ 13