Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Cash Flows) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	$ 965	$ 1,121
Property and equipment additions	(117)	(115)
Proceeds received on asset sales	6	6
Payments to Acquire Restricted Investments	(54)	(28)
Other, net	81	(37)
Net cash used in investing activities exclusive of vehicle programs	(84)	(174)
Investment in vehicles	(8,715)	(8,359)
Proceeds received on disposition of vehicles	5,773	4,807
Investment in debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	(167)	(22)
Proceeds from debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	47	0
Net cash used in investing activities of vehicle programs	(3,062)	(3,574)
Net cash used in investing activities	(3,146)	(3,748)
Proceeds from long-term borrowings	2	81
Principal payments on borrowings	(12)	(94)
Net change in short-term borrowings	0	(2)
Repurchases of common stock	(4)	(78)
Debt financing fees	0	(9)
Other, net	(17)	2
Net cash provided by financing activities exclusive of vehicle programs	(31)	(100)
Proceeds from borrowings	11,758	10,145
Principal payments on borrowings	(9,688)	(7,643)
Debt financing fees	(12)	(13)
Net cash provided by financing activities of vehicle programs	2,058	2,489
Net cash provided by financing activities	2,027	2,389
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	4	(2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(150)	(240)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	585	661	$ 735	$ 901
Eliminations [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	(16)	(95)
Property and equipment additions	0	0
Proceeds received on asset sales	0	0
Payments to Acquire Restricted Investments	0	0
Other, net	0	0
Net cash used in investing activities exclusive of vehicle programs	0	0
Investment in vehicles	0	0
Proceeds received on disposition of vehicles	0	0
Investment in debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0	0
Proceeds from debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0
Net cash used in investing activities of vehicle programs	0	0
Net cash used in investing activities	0	0
Proceeds from long-term borrowings	0	0
Principal payments on borrowings	0	0
Net change in short-term borrowings		0
Repurchases of common stock	0	0
Debt financing fees		0
Other, net	16	95
Net cash provided by financing activities exclusive of vehicle programs	16	95
Proceeds from borrowings	0	0
Principal payments on borrowings	0	0
Debt financing fees	0	0
Net cash provided by financing activities of vehicle programs	0	0
Net cash provided by financing activities	16	95
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	0	0
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	571	647
Parent Company [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	20	75
Property and equipment additions	0	0
Proceeds received on asset sales	0	0
Payments to Acquire Restricted Investments	0	0
Other, net	0	0
Net cash used in investing activities exclusive of vehicle programs	0	0
Investment in vehicles	0	0
Proceeds received on disposition of vehicles	0	0
Investment in debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0	0
Proceeds from debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0
Net cash used in investing activities of vehicle programs	0	0
Net cash used in investing activities	0	0
Proceeds from long-term borrowings	0	0
Principal payments on borrowings	0	0
Net change in short-term borrowings		0
Repurchases of common stock	(4)	(78)
Debt financing fees		0
Other, net	(16)	2
Net cash provided by financing activities exclusive of vehicle programs	(20)	(76)
Proceeds from borrowings	0	0
Principal payments on borrowings	0	0
Debt financing fees	0	0
Net cash provided by financing activities of vehicle programs	0	0
Net cash provided by financing activities	(20)	(76)
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	(1)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1	3	1	4
Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	43	107
Property and equipment additions	(35)	(33)
Proceeds received on asset sales	1	2
Payments to Acquire Restricted Investments	0	(3)
Other, net	0	0
Net cash used in investing activities exclusive of vehicle programs	(34)	(34)
Investment in vehicles	(5)	(1)
Proceeds received on disposition of vehicles	24	17
Investment in debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0	0
Proceeds from debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0
Net cash used in investing activities of vehicle programs	19	16
Net cash used in investing activities	(15)	(18)
Proceeds from long-term borrowings	0	81
Principal payments on borrowings	(9)	(92)
Net change in short-term borrowings		0
Repurchases of common stock	0	0
Debt financing fees		(9)
Other, net	(17)	(71)
Net cash provided by financing activities exclusive of vehicle programs	(26)	(91)
Proceeds from borrowings	0	0
Principal payments on borrowings	(2)	(1)
Debt financing fees	0	0
Net cash provided by financing activities of vehicle programs	(2)	(1)
Net cash provided by financing activities	(28)	(92)
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	(3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	12	11	12	14
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	50	66
Property and equipment additions	(49)	(43)
Proceeds received on asset sales	0	0
Payments to Acquire Restricted Investments	(4)	(4)
Other, net	12	0
Net cash used in investing activities exclusive of vehicle programs	(41)	(47)
Investment in vehicles	(2)	(1)
Proceeds received on disposition of vehicles	0	0
Investment in debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0	0
Proceeds from debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	0
Net cash used in investing activities of vehicle programs	(2)	(1)
Net cash used in investing activities	(43)	(48)
Proceeds from long-term borrowings	0	0
Principal payments on borrowings	(2)	(1)
Net change in short-term borrowings		0
Repurchases of common stock	0	0
Debt financing fees		0
Other, net	0	(12)
Net cash provided by financing activities exclusive of vehicle programs	(2)	(13)
Proceeds from borrowings	0	0
Principal payments on borrowings	(5)	(5)
Debt financing fees	0	0
Net cash provided by financing activities of vehicle programs	(5)	(5)
Net cash provided by financing activities	(7)	(18)
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1	0	1	0
Subsidiaries Non Guarantor [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	868	968
Property and equipment additions	(33)	(39)
Proceeds received on asset sales	5	4
Payments to Acquire Restricted Investments	(50)	(21)
Other, net	69	(37)
Net cash used in investing activities exclusive of vehicle programs	(9)	(93)
Investment in vehicles	(8,708)	(8,357)
Proceeds received on disposition of vehicles	5,749	4,790
Investment in debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	(167)	(22)
Proceeds from debt securities of Avis Budget Rental Car Funding (AESOP) LLC—related party	47
Net cash used in investing activities of vehicle programs	(3,079)	(3,589)
Net cash used in investing activities	(3,088)	(3,682)
Proceeds from long-term borrowings	2	0
Principal payments on borrowings	(1)	(1)
Net change in short-term borrowings		(2)
Repurchases of common stock	0	0
Debt financing fees		0
Other, net	0	(12)
Net cash provided by financing activities exclusive of vehicle programs	1	(15)
Proceeds from borrowings	11,758	10,145
Principal payments on borrowings	(9,681)	(7,637)
Debt financing fees	(12)	(13)
Net cash provided by financing activities of vehicle programs	2,065	2,495
Net cash provided by financing activities	2,066	2,480
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash	4	(2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(150)	(236)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 571	$ 647	$ 721	$ 883