Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ 312	$ 529
Basic weighted average shares outstanding (in shares)	39.6	53.1
Non-vested stock (in shares)	0.8	1.4
Diluted weighted average shares outstanding (in shares)	40.4	54.5
Earnings per share:
Basic (in usd per share)	$ 7.88	$ 9.96
Diluted (in usd per share)	$ 7.72	$ 9.71
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.1	0.1