Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ 435	$ 778	$ 747	$ 1,307
Basic weighted average shares outstanding (in shares)	39.1	48.5	39.0	50.8
Non-vested stock (in shares)	0.4	1.0	0.5	1.2
Diluted weighted average shares outstanding (in shares)	39.5	49.5	39.5	52.0
Earnings per share:
Basic (in usd per share)	$ 11.13	$ 16.05	$ 19.16	$ 25.74
Diluted (in usd per share)	$ 11.01	$ 15.71	$ 18.93	$ 25.14
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.1		0.1	0.1