Stockholders' Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity [Abstract]
Net income (loss)	$ (113)	$ 312
Less: net income attributable to non-controlling interests	1	0
Net income (loss) attributable to Avis Budget Group, Inc.	(114)	312
Other comprehensive income (loss):
Currency translation adjustments (net of tax of $(5) and $3, respectively)	(52)	(4)
Net unrealized gain (loss) on cash flow hedges (net of tax of $(2) and $2, respectively)	7	(7)
Minimum pension liability adjustment (net of tax of $0 in each period)	1	1
Other comprehensive income (loss)	(44)	(10)
Comprehensive income (loss) attributable to Avis Budget Group, Inc.	(158)	302
Currency translation adjustments, tax	(5)	3
Net unrealized gain (loss) on cash flow hedges, tax	(2)	2
Minimum pension liability adjustment, tax	$ 0	$ 0