Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net loss attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ (283)	$ (505)
Basic weighted average shares outstanding (in shares)	35.3	35.2
Diluted weighted average shares outstanding (in shares)	35.3	35.2
Loss per share
Basic (in usd per share)	$ (8.01)	$ (14.35)
Diluted (in usd per share)	$ (8.01)	$ (14.35)
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.4	0.5