Earnings Per Share (Schedule of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ 237	$ 626	$ 137	$ 1,373
Basic weighted average shares outstanding (in shares)	35.5	36.9	35.6	39.1
Non-vested stock (in shares)	0.2	0.4	0.2	0.4
Diluted weighted average shares outstanding (in shares)	35.7	37.3	35.8	39.5
Earnings per share
Basic (in usd per share)	$ 6.67	$ 16.96	$ 3.86	$ 35.11
Diluted (in usd per share)	$ 6.65	$ 16.78	$ 3.84	$ 34.71
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.2	0.0	0.2	0.1