Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ 1,034	$ 675	$ 2,341	$ 903
Basic weighted average shares outstanding (in shares)	46.8	63.7	49.5	67.8
Non-vested stock (in shares)	0.9	0.9	1.1	0.8
Diluted weighted average shares outstanding (in shares)	47.7	64.6	50.6	68.6
Earnings per share:
Basic (in usd per share)	$ 22.08	$ 10.58	$ 47.34	$ 13.31
Diluted (in usd per share)	$ 21.67	$ 10.45	$ 46.32	$ 13.16
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0.1		0.1	0.4