Stockholders' Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity [Abstract]
Net income	$ 238	$ 627	$ 140	$ 1,375
Less: net income attributable to non-controlling interests	1	1	3	2
Net income attributable to Avis Budget Group, Inc.	237	626	137	1,373
Other comprehensive income (loss):
Currency translation adjustments (net of tax of $13, $(8), $5 and $(3), respectively)	38	(43)	(7)	(41)
Net unrealized gain (loss) on cash flow hedges (net of tax of $5, $(1), $4 and $(3), respectively)	(16)	2	(12)	9
Minimum pension liability adjustment (net of tax of $(1), $(1), $(1), and $(1), respectively)	1	1	3	3
Net current-period other comprehensive income (loss)	23	(40)	(16)	(29)
Comprehensive income attributable to Avis Budget Group, Inc.	260	586	121	1,344
Currency translation adjustments, tax	13	(8)	5	(3)
Net unrealized gain (loss) on cash flow hedges, tax	5	(1)	4	(3)
Minimum pension liability adjustment, tax	$ (1)	$ (1)	$ (1)	$ (1)