Stockholders' Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Equity [Abstract]
Net income (loss)	$ 15	$ 436	$ (98)	$ 748
Less: net income attributable to non-controlling interests	1	1	2	1
Net income (loss) attributable to Avis Budget Group, Inc.	14	435	(100)	747
Other comprehensive income (loss):
Currency translation adjustments (net of tax of $5, $2, $0 and $5, respectively)	7	6	(45)	2
Net unrealized gain (loss) on cash flow hedges (net of tax of $1, $(4), $(1) and $(2), respectively)	(3)	14	4	7
Minimum pension liability adjustment (net of tax of $0 in each period)	1	1	2	2
Other comprehensive income	5	21	(39)	11
Comprehensive income (loss) attributable to Avis Budget Group, Inc.	19	456	(139)	758
Currency translation adjustments, tax	(3)	2	(8)	5
Net unrealized gain (loss) on cash flow hedges, tax	1	(4)	(1)	(2)
Minimum pension liability adjustment, tax	$ 0	$ 0	$ 0	$ 0