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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ 14	$ 435	$ (100)	$ 747
Basic weighted average shares outstanding (in shares)	35.6	39.1	35.6	39.0
Non-vested stock (in shares)	0.1	0.4	0.0	0.5
Diluted weighted average shares outstanding (in shares)	35.7	39.5	35.6	39.5
Earnings (loss) per share:
Basic (in usd per share)	$ 0.41	$ 11.13	$ (2.80)	$ 19.16
Diluted (in usd per share)	$ 0.41	$ 11.01	$ (2.80)	$ 18.93
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.2	0.1	0.4	0.1