Debt Under Vehicle Programs And Borrowing Arrangements - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended	36 Months Ended
	Dec. 31, 2014	Dec. 31, 2019	Dec. 31, 2020
Avis Budget Rental Car Funding Program March 2022 [Member]
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value			$ 600
Avis Budget Rental Car Funding Program September 2024 [Member]
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value			650
Avis Budget Rental Car Funding Program March 2025 [Member]
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value			$ 650
Avis Budget Rental Car Funding Program [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		3.16%	3.17%
European Rental Fleet Securitization [Member]
Debt Instrument [Line Items]
Newly Issued European Credit Facility	$ 500	$ 1,700
Americas Debt Borrowings [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		2.87%	2.98%
International Debt Borrowings
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		1.87%	2.17%
Debt Due To Rental Car Funding August 2025 [Member]
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value			$ 700
Debt Due To Rental Car Funding February 2026 [Member]
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value			$ 650