Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to Avis Budget Group, Inc.	$ 2,764	$ 1,285	$ (684)
Basic weighted average shares outstanding (in shares)	47.3	64.9	70.5
Options and non-vested stock (in shares)	1.1	1.2	0.0
Diluted weighted average shares outstanding (in shares)	48.4	66.1	70.5
Earnings (loss) per share:
Basic (in USD per share)	$ 58.41	$ 19.79	$ (9.71)
Diluted (in USD per share)	$ 57.16	$ 19.44	$ (9.71)