Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Unrecognized tax benefit in non-current income taxes payable	$ 30	$ 24
Accrued interest payable on potential tax liabilities	29	29
Unrecognized Tax Benefits	58	57	$ 54	$ 61
Non Avis Budget Car Rental Tax Contingencies
Income Taxes [Line Items]
Unrecognized Tax Benefits	$ 13	$ 13