Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to Avis Budget Group, Inc. for basic and diluted EPS	$ 778	$ 398	$ 1,307	$ 228
Basic weighted average shares outstanding (in shares)	48.5	69.9	50.8	69.9
Non-vested stock (in shares)	1.0	0.7	1.2	0.7
Diluted weighted average shares outstanding (in shares)	49.5	70.6	52.0	70.6
Earnings per share:
Basic (in usd per share)	$ 16.05	$ 5.69	$ 25.74	$ 3.26
Diluted (in usd per share)	$ 15.71	$ 5.63	$ 25.14	$ 3.23
Non-vested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)			0.1