Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net loss attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ (505)	$ (114)
Basic weighted average shares outstanding (in shares)	35.2	35.6
Diluted weighted average shares outstanding (in shares)	35.2	35.6
Loss per share
Basic (in usd per share)	$ (14.35)	$ (3.21)
Diluted (in usd per share)	$ (14.35)	$ (3.21)
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.5	0.3