Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 615		$ 615	$ 605
Receivables, net	872		955
Other current assets	660		604
Total current assets	2,147		2,174
Property and equipment, net	752		736
Operating lease right-of-use assets	2,365		0
Deferred income taxes	1,360		1,301
Goodwill	1,083		1,092
Other intangibles, net	792		825
Other non-current assets	221		242
Intercompany receivables	0		0
Investment in subsidiaries	0		0
Total assets exclusive of assets under vehicle programs	8,720		6,370
Assets under vehicle programs:
Program cash	89		115	151
Vehicles, net	12,752		11,474
Receivables from vehicle manufacturers and other	905		631
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	642		559
Total Assets under vehicle programs	14,388		12,779
Total assets	23,108		19,149
Current liabilities:
Accounts payable and other current liabilities	2,195		1,693
Short-term debt and current portion of long-term debt	95		23
Total current liabilities	2,290		1,716
Long-term debt	3,388		3,528
Long-term operating lease liabilities	1,966		0
Other non-current liabilities	748		767
Intercompany payables	0		0
Total liabilities exclusive of liabilities under vehicle programs	8,392		6,011
Liabilities under vehicle programs:
Debt	3,722		2,874
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	7,870		7,358
Deferred income taxes	2,058		1,961
Other	571		531
Total Liabilities under vehicle programs	14,221		12,724
Total stockholders’ equity	495	$ 376	414	521	$ 372	$ 573
Total liabilities and stockholders’ equity	23,108		19,149
Restricted Cash and Cash Equivalents	4			12
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	708		735	768		901
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents				529
Assets under vehicle programs:
Program cash				151
Liabilities under vehicle programs:
Restricted Cash and Cash Equivalents	4			12
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	693			692
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	168		159
Investment in subsidiaries	323		246
Total assets exclusive of assets under vehicle programs	556		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	556		471
Current liabilities:
Accounts payable and other current liabilities	17		16
Short-term debt and current portion of long-term debt	0		0
Total current liabilities	17		16
Long-term debt	0		0
Long-term operating lease liabilities	0
Other non-current liabilities	44		41
Intercompany payables	0		0
Total liabilities exclusive of liabilities under vehicle programs	61		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	495		414
Total liabilities and stockholders’ equity	556		471
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1		1	3		4
Subsidiaries [Member]
Current assets:
Cash and cash equivalents	13		12
Receivables, net	0		0
Other current assets	118		112
Total current assets	131		124
Property and equipment, net	223		199
Operating lease right-of-use assets	707
Deferred income taxes	1,076		1,015
Goodwill	0		0
Other intangibles, net	25		26
Other non-current assets	31		39
Intercompany receivables	422		404
Investment in subsidiaries	5,035		4,786
Total assets exclusive of assets under vehicle programs	7,650		6,593
Assets under vehicle programs:
Program cash	0		0
Vehicles, net	155		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	158		57
Total assets	7,808		6,650
Current liabilities:
Accounts payable and other current liabilities	295		246
Short-term debt and current portion of long-term debt	92		18
Total current liabilities	387		264
Long-term debt	2,417		2,501
Long-term operating lease liabilities	643
Other non-current liabilities	106		87
Intercompany payables	3,813		3,524
Total liabilities exclusive of liabilities under vehicle programs	7,366		6,376
Liabilities under vehicle programs:
Debt	91		28
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0		0
Deferred income taxes	0		0
Other	28		0
Total Liabilities under vehicle programs	119		28
Total stockholders’ equity	323		246
Total liabilities and stockholders’ equity	7,808		6,650
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	13		12	73		14
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	1		1
Receivables, net	257		239
Other current assets	125		116
Total current assets	383		356
Property and equipment, net	328		319
Operating lease right-of-use assets	1,123
Deferred income taxes	207		207
Goodwill	470		471
Other intangibles, net	474		475
Other non-current assets	15		16
Intercompany receivables	2,332		2,104
Investment in subsidiaries	3,982		3,852
Total assets exclusive of assets under vehicle programs	9,314		7,800
Assets under vehicle programs:
Program cash	0		0
Vehicles, net	55		54
Receivables from vehicle manufacturers and other	100		0
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0		0
Total Assets under vehicle programs	155		54
Total assets	9,469		7,854
Current liabilities:
Accounts payable and other current liabilities	826		582
Short-term debt and current portion of long-term debt	2		3
Total current liabilities	828		585
Long-term debt	2		3
Long-term operating lease liabilities	941
Other non-current liabilities	226		257
Intercompany payables	422		404
Total liabilities exclusive of liabilities under vehicle programs	2,419		1,249
Liabilities under vehicle programs:
Debt	41		49
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0		0
Deferred income taxes	1,874		1,770
Other	100		0
Total Liabilities under vehicle programs	2,015		1,819
Total stockholders’ equity	5,035		4,786
Total liabilities and stockholders’ equity	9,469		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	600		601
Receivables, net	615		716
Other current assets	416		371
Total current assets	1,631		1,688
Property and equipment, net	201		218
Operating lease right-of-use assets	535
Deferred income taxes	63		66
Goodwill	613		621
Other intangibles, net	293		324
Other non-current assets	126		140
Intercompany receivables	1,315		1,262
Investment in subsidiaries	0		0
Total assets exclusive of assets under vehicle programs	4,777		4,319
Assets under vehicle programs:
Program cash	89		115
Vehicles, net	12,542		11,365
Receivables from vehicle manufacturers and other	802		629
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	642		559
Total Assets under vehicle programs	14,075		12,668
Total assets	18,852		16,987
Current liabilities:
Accounts payable and other current liabilities	1,057		849
Short-term debt and current portion of long-term debt	1		2
Total current liabilities	1,058		851
Long-term debt	969		1,024
Long-term operating lease liabilities	382
Other non-current liabilities	372		382
Intercompany payables	2		1
Total liabilities exclusive of liabilities under vehicle programs	2,783		2,258
Liabilities under vehicle programs:
Debt	3,590		2,797
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	7,870		7,358
Deferred income taxes	184		191
Other	443		531
Total Liabilities under vehicle programs	12,087		10,877
Total stockholders’ equity	3,982		3,852
Total liabilities and stockholders’ equity	18,852		16,987
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	693		721	692		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	(4,237)		(3,929)
Investment in subsidiaries	(9,340)		(8,884)
Total assets exclusive of assets under vehicle programs	(13,577)		(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	(13,577)		(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	(4,237)		(3,929)
Total liabilities exclusive of liabilities under vehicle programs	(4,237)		(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	(9,340)		(8,884)
Total liabilities and stockholders’ equity	(13,577)		(12,813)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0		$ 0	$ 0		$ 0