Debt under Vehicle Programs And Borrowing Arrangements - Debt Issued by AESOP (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.33%		6.04%
Asset-backed securities, at carrying value	$ 1,708		$ 2,839
Avis Budget Rental Car Funding Program August 2027
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.31%
Asset-backed securities, at carrying value	$ 41
Avis Budget Rental Car Funding Program April 2028
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.59%
Asset-backed securities, at carrying value	$ 75
Avis Budget Rental Car Funding Program June 2028
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.31%
Asset-backed securities, at carrying value	$ 75
Avis Budget Rental Car Funding Program December 2028
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.37%
Asset-backed securities, at carrying value	$ 72
Avis Budget Rental Car Funding Program February 2029
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.52%
Asset-backed securities, at carrying value	$ 95
Avis Budget Rental Car Funding Program August 2028
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.94%
Asset-backed securities, at carrying value	$ 250
Avis Budget Rental Car Funding Program August 2030
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.26%
Asset-backed securities, at carrying value	$ 400
Avis Budget Rental Car Funding Program February 2029 Issued September 2025
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.27%
Asset-backed securities, at carrying value	$ 250
Avis Budget Rental Car Funding Program February 2031
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.52%
Asset-backed securities, at carrying value	$ 450
Avis Budget Rental Car Funding Program June 2029
Debt Instrument [Line Items]
Weighted Average Interest Rate			5.51%
Asset-backed securities, at carrying value			$ 1,200
Avis Budget Rental Car Funding Program April 2026
Debt Instrument [Line Items]
Weighted Average Interest Rate			6.24%
Asset-backed securities, at carrying value			$ 53
Avis Budget Rental Car Funding Program April 2028
Debt Instrument [Line Items]
Weighted Average Interest Rate			6.23%
Asset-backed securities, at carrying value			$ 52
Avis Budget Rental Car Funding Program October 2026
Debt Instrument [Line Items]
Weighted Average Interest Rate			6.18%
Asset-backed securities, at carrying value			$ 37
Avis Budget Rental Car Funding Program October 2027
Debt Instrument [Line Items]
Weighted Average Interest Rate			5.26%
Asset-backed securities, at carrying value			$ 400
Avis Budget Rental Car Funding Program December 2029
Debt Instrument [Line Items]
Weighted Average Interest Rate			5.35%
Asset-backed securities, at carrying value			$ 700
Avis Budget Rental Car Funding Program February 2026
Debt Instrument [Line Items]
Weighted Average Interest Rate		8.52%	9.56%
Asset-backed securities, at carrying value			$ 88
Avis Budget Rental Car Funding Program April 2026
Debt Instrument [Line Items]
Weighted Average Interest Rate		8.46%	9.56%
Asset-backed securities, at carrying value			$ 75
Avis Budget Rental Car Funding Program October 2026
Debt Instrument [Line Items]
Weighted Average Interest Rate		7.26%	9.61%
Asset-backed securities, at carrying value			$ 53
Avis Budget Rental Car Funding Program February 2027
Debt Instrument [Line Items]
Weighted Average Interest Rate		7.32%	9.65%
Asset-backed securities, at carrying value			$ 61
Avis Budget Rental Car Funding Program April 2027
Debt Instrument [Line Items]
Weighted Average Interest Rate		7.35%	9.66%
Asset-backed securities, at carrying value			$ 65
Avis Budget Rental Car Funding Program October 2027
Debt Instrument [Line Items]
Weighted Average Interest Rate		7.43%	9.67%
Asset-backed securities, at carrying value			$ 55