Stockholders' Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity [Abstract]
Net income	$ 627	$ 1,031	$ 1,375	$ 2,332
Less: net income (loss) attributable to non-controlling interests	1	(3)	2	(9)
Net income	626	1,034	1,373	2,341
Other comprehensive income (loss):
Currency translation adjustments (net of tax of $(8), $(16), $(3) and $(33), respectively)	(43)	(78)	(41)	(121)
Net unrealized gain (loss) on cash flow hedges (net of tax of $(1), $(8), $(3) and $(23), respectively)	2	22	9	65
Minimum pension liability adjustment (net of tax of $(1), $0, $(1), $0, respectively)	1	1	3	4
Other comprehensive income (loss)	(40)	(55)	(29)	(52)
Comprehensive income attributable to Avis Budget Group, Inc.	586	979	1,344	2,289
Currency translation adjustments, tax	(8)	(16)	(3)	(33)
Net unrealized gain (loss) on cash flow hedges, tax	(1)	(8)	(3)	(23)
Minimum pension liability adjustment, tax	$ (1)	$ 0	$ (1)	$ 0