Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ (114)	$ 312
Basic weighted average shares outstanding (in shares)	35.6	39.6
Non-vested stock (in shares)	0.0	0.8
Diluted weighted average shares outstanding (in shares)	35.6	40.4
Earnings (loss) per share:
Basic (in usd per share)	$ (3.21)	$ 7.88
Diluted (in usd per share)	$ (3.21)	$ 7.72
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.3	0.1