Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 534		$ 615	$ 489
Receivables, net	920		955
Other current assets	832		604
Total current assets	2,286		2,174
Property and equipment, net	749		736
Operating lease right-of-use assets	2,409		0
Deferred income taxes	1,438		1,301
Goodwill	1,107		1,092
Other intangibles, net	806		825
Other non-current assets	223		242
Intercompany receivables	0		0
Investment in subsidiaries	0		0
Total assets exclusive of assets under vehicle programs	9,018		6,370
Assets under vehicle programs:
Program cash	48		115	161
Vehicles, net	14,278		11,474
Receivables from vehicle manufacturers and other	432		631
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	679		559
Total Assets under vehicle programs	15,437		12,779
Total assets	24,455		19,149
Current liabilities:
Accounts payable and other current liabilities	2,249		1,693
Short-term debt and current portion of long-term debt	420		23
Total current liabilities	2,669		1,716
Long-term debt	3,115		3,528
Long-term operating lease liabilities	1,995		0
Other non-current liabilities	752		767
Intercompany payables	0		0
Total liabilities exclusive of liabilities under vehicle programs	8,531		6,011
Liabilities under vehicle programs:
Debt	3,543		2,874
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	8,913		7,358
Deferred income taxes	2,029		1,961
Other	1,063		531
Total Liabilities under vehicle programs	15,548		12,724
Total stockholders’ equity	376	$ 324	414	372	$ 455	$ 573
Total liabilities and stockholders’ equity	24,455		19,149
Restricted Cash and Cash Equivalents	3			11
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	585		735	661		901
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents				475
Assets under vehicle programs:
Program cash				161
Liabilities under vehicle programs:
Restricted Cash and Cash Equivalents	3			11
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	571			647
Parent Company [Member]
Current assets:
Cash and cash equivalents	1		1
Receivables, net	0		0
Other current assets	1		5
Total current assets	2		6
Property and equipment, net	0		0
Operating lease right-of-use assets	0
Deferred income taxes	14		13
Goodwill	0		0
Other intangibles, net	0		0
Other non-current assets	49		47
Intercompany receivables	165		159
Investment in subsidiaries	203		246
Total assets exclusive of assets under vehicle programs	433		471
Assets under vehicle programs:
Program cash	0		0
Vehicles, net	0		0
Receivables from vehicle manufacturers and other	0		0
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0		0
Total Assets under vehicle programs	0		0
Total assets	433		471
Current liabilities:
Accounts payable and other current liabilities	15		16
Short-term debt and current portion of long-term debt	0		0
Total current liabilities	15		16
Long-term debt	0		0
Long-term operating lease liabilities	0
Other non-current liabilities	42		41
Intercompany payables	0		0
Total liabilities exclusive of liabilities under vehicle programs	57		57
Liabilities under vehicle programs:
Debt	0		0
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0		0
Deferred income taxes	0		0
Other	0		0
Total Liabilities under vehicle programs	0		0
Total stockholders’ equity	376		414
Total liabilities and stockholders’ equity	433		471
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1		1	3		4
Subsidiaries [Member]
Current assets:
Cash and cash equivalents	12		12
Receivables, net	0		0
Other current assets	134		112
Total current assets	146		124
Property and equipment, net	214		199
Operating lease right-of-use assets	700
Deferred income taxes	1,136		1,015
Goodwill	0		0
Other intangibles, net	25		26
Other non-current assets	32		39
Intercompany receivables	416		404
Investment in subsidiaries	4,779		4,786
Total assets exclusive of assets under vehicle programs	7,448		6,593
Assets under vehicle programs:
Program cash	0		0
Vehicles, net	68		55
Receivables from vehicle manufacturers and other	3		2
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0		0
Total Assets under vehicle programs	71		57
Total assets	7,519		6,650
Current liabilities:
Accounts payable and other current liabilities	297		246
Short-term debt and current portion of long-term debt	415		18
Total current liabilities	712		264
Long-term debt	2,099		2,501
Long-term operating lease liabilities	622
Other non-current liabilities	102		87
Intercompany payables	3,749		3,524
Total liabilities exclusive of liabilities under vehicle programs	7,284		6,376
Liabilities under vehicle programs:
Debt	32		28
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0		0
Deferred income taxes	0		0
Other	0		0
Total Liabilities under vehicle programs	32		28
Total stockholders’ equity	203		246
Total liabilities and stockholders’ equity	7,519		6,650
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	12		12	11		14
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	1		1
Receivables, net	277		239
Other current assets	131		116
Total current assets	409		356
Property and equipment, net	326		319
Operating lease right-of-use assets	1,138
Deferred income taxes	207		207
Goodwill	471		471
Other intangibles, net	471		475
Other non-current assets	15		16
Intercompany receivables	2,213		2,104
Investment in subsidiaries	3,847		3,852
Total assets exclusive of assets under vehicle programs	9,097		7,800
Assets under vehicle programs:
Program cash	0		0
Vehicles, net	52		54
Receivables from vehicle manufacturers and other	94		0
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0		0
Total Assets under vehicle programs	146		54
Total assets	9,243		7,854
Current liabilities:
Accounts payable and other current liabilities	862		582
Short-term debt and current portion of long-term debt	2		3
Total current liabilities	864		585
Long-term debt	2		3
Long-term operating lease liabilities	968
Other non-current liabilities	229		257
Intercompany payables	416		404
Total liabilities exclusive of liabilities under vehicle programs	2,479		1,249
Liabilities under vehicle programs:
Debt	46		49
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0		0
Deferred income taxes	1,840		1,770
Other	99		0
Total Liabilities under vehicle programs	1,985		1,819
Total stockholders’ equity	4,779		4,786
Total liabilities and stockholders’ equity	9,243		7,854
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1		1	0		0
Subsidiaries Non Guarantor [Member]
Current assets:
Cash and cash equivalents	520		601
Receivables, net	643		716
Other current assets	566		371
Total current assets	1,729		1,688
Property and equipment, net	209		218
Operating lease right-of-use assets	571
Deferred income taxes	81		66
Goodwill	636		621
Other intangibles, net	310		324
Other non-current assets	127		140
Intercompany receivables	1,372		1,262
Investment in subsidiaries	0		0
Total assets exclusive of assets under vehicle programs	5,035		4,319
Assets under vehicle programs:
Program cash	48		115
Vehicles, net	14,158		11,365
Receivables from vehicle manufacturers and other	335		629
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	679		559
Total Assets under vehicle programs	15,220		12,668
Total assets	20,255		16,987
Current liabilities:
Accounts payable and other current liabilities	1,075		849
Short-term debt and current portion of long-term debt	3		2
Total current liabilities	1,078		851
Long-term debt	1,014		1,024
Long-term operating lease liabilities	405
Other non-current liabilities	379		382
Intercompany payables	1		1
Total liabilities exclusive of liabilities under vehicle programs	2,877		2,258
Liabilities under vehicle programs:
Debt	3,465		2,797
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	8,913		7,358
Deferred income taxes	189		191
Other	964		531
Total Liabilities under vehicle programs	13,531		10,877
Total stockholders’ equity	3,847		3,852
Total liabilities and stockholders’ equity	20,255		16,987
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	571		721	647		883
Eliminations [Member]
Current assets:
Cash and cash equivalents	0		0
Receivables, net	0		0
Other current assets	0		0
Total current assets	0		0
Property and equipment, net	0		0
Operating lease right-of-use assets	0
Deferred income taxes	0		0
Goodwill	0		0
Other intangibles, net	0		0
Other non-current assets	0		0
Intercompany receivables	(4,166)		(3,929)
Investment in subsidiaries	(8,829)		(8,884)
Total assets exclusive of assets under vehicle programs	(12,995)		(12,813)
Assets under vehicle programs:
Program cash	0		0
Vehicles, net	0		0
Receivables from vehicle manufacturers and other	0		0
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0		0
Total Assets under vehicle programs	0		0
Total assets	(12,995)		(12,813)
Current liabilities:
Accounts payable and other current liabilities	0		0
Short-term debt and current portion of long-term debt	0		0
Total current liabilities	0		0
Long-term debt	0		0
Long-term operating lease liabilities	0
Other non-current liabilities	0		0
Intercompany payables	(4,166)		(3,929)
Total liabilities exclusive of liabilities under vehicle programs	(4,166)		(3,929)
Liabilities under vehicle programs:
Debt	0		0
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0		0
Deferred income taxes	0		0
Other	0		0
Total Liabilities under vehicle programs	0		0
Total stockholders’ equity	(8,829)		(8,884)
Total liabilities and stockholders’ equity	(12,995)		(12,813)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0		$ 0	$ 0		$ 0