Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Supplemental Guarantor Financial Information [Line Items]
Document Fiscal Year Focus	2018
Current assets:
Cash and cash equivalents	$ 605	$ 611	$ 814
Receivables, net	918	922
Other current assets	657	533
Total current assets	2,180	2,066
Property and equipment, net	719	704
Deferred income taxes	1,065	931
Goodwill	1,064	1,073
Other intangibles, net	844	850
Other non-current assets	267	196
Intercompany receivables (payables)	0	0
Investment in subsidiaries	0	0
Total assets exclusive of assets under vehicle programs	6,139	5,820
Assets under vehicle programs:
Program cash	151	283	180
Vehicles, net	12,163	10,626
Receivables from vehicle manufacturers and other	772	547
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	516	423
Total Assets under vehicle programs	13,602	11,879
Total assets	19,741	17,699
Current liabilities:
Accounts payable and other current liabilities	1,885	1,619
Long-term Debt, Current Maturities	23	26
Total current liabilities	1,908	1,645
Long-term debt	3,538	3,573
Other non-current liabilities	767	717
Due to Related Parties, Noncurrent	0	0
Total liabilities exclusive of liabilities under vehicle programs	6,213	5,935
Liabilities under vehicle programs:
Debt	3,800	2,741
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	7,122	6,480
Deferred income taxes	1,775	1,594
Other	310	376
Total Liabilities under vehicle programs	13,007	11,191
Total stockholders' equity	521	573
Total liabilities and stockholders’ equity	19,741	17,699
Restricted Cash and Cash Equivalents	12		7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	768	901	1,001	$ 720
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	529		794
Assets under vehicle programs:
Program cash	151		180
Liabilities under vehicle programs:
Restricted Cash and Cash Equivalents	12		7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	692		981	705
Parent Company [Member]
Current assets:
Cash and cash equivalents	3	4
Receivables, net	0	0
Other current assets	1	4
Total current assets	4	8
Property and equipment, net	0	0
Deferred income taxes	13	14
Goodwill	0	0
Other intangibles, net	0	0
Other non-current assets	46	46
Intercompany receivables (payables)	156	187
Investment in subsidiaries	355	381
Total assets exclusive of assets under vehicle programs	574	636
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	574	636
Current liabilities:
Accounts payable and other current liabilities	13	23
Long-term Debt, Current Maturities	0	0
Total current liabilities	13	23
Long-term debt	0	0
Other non-current liabilities	40	40
Due to Related Parties, Noncurrent	0	0
Total liabilities exclusive of liabilities under vehicle programs	53	63
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	521	573
Total liabilities and stockholders’ equity	574	636
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	3	4	3	3
Subsidiaries [Member]
Current assets:
Cash and cash equivalents	73	14
Receivables, net	0	0
Other current assets	100	89
Total current assets	173	103
Property and equipment, net	191	167
Deferred income taxes	842	704
Goodwill	0	0
Other intangibles, net	26	27
Other non-current assets	48	29
Intercompany receivables (payables)	399	382
Investment in subsidiaries	4,841	4,681
Total assets exclusive of assets under vehicle programs	6,520	6,093
Assets under vehicle programs:
Program cash	0	0
Vehicles, net	38	34
Receivables from vehicle manufacturers and other	2	1
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0	0
Total Assets under vehicle programs	40	35
Total assets	6,560	6,128
Current liabilities:
Accounts payable and other current liabilities	248	207
Long-term Debt, Current Maturities	17	17
Total current liabilities	265	224
Long-term debt	2,900	2,910
Other non-current liabilities	80	83
Due to Related Parties, Noncurrent	2,941	2,515
Total liabilities exclusive of liabilities under vehicle programs	6,186	5,732
Liabilities under vehicle programs:
Debt	19	15
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	19	15
Total stockholders' equity	355	381
Total liabilities and stockholders’ equity	6,560	6,128
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	73	14	17	12
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	0
Receivables, net	247	255
Other current assets	109	101
Total current assets	356	356
Property and equipment, net	312	321
Deferred income taxes	169	154
Goodwill	471	471
Other intangibles, net	474	480
Other non-current assets	16	16
Intercompany receivables (payables)	1,880	1,506
Investment in subsidiaries	4,043	3,938
Total assets exclusive of assets under vehicle programs	7,721	7,242
Assets under vehicle programs:
Program cash	0	0
Vehicles, net	58	61
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	58	61
Total assets	7,779	7,303
Current liabilities:
Accounts payable and other current liabilities	633	552
Long-term Debt, Current Maturities	2	3
Total current liabilities	635	555
Long-term debt	2	3
Other non-current liabilities	261	216
Due to Related Parties, Noncurrent	399	382
Total liabilities exclusive of liabilities under vehicle programs	1,297	1,156
Liabilities under vehicle programs:
Debt	50	57
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0	0
Deferred income taxes	1,591	1,407
Other	0	2
Total Liabilities under vehicle programs	1,641	1,466
Total stockholders' equity	4,841	4,681
Total liabilities and stockholders’ equity	7,779	7,303
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	0	0
Subsidiaries Non Guarantor [Member]
Current assets:
Cash and cash equivalents	529	593
Receivables, net	671	667
Other current assets	447	339
Total current assets	1,647	1,599
Property and equipment, net	216	216
Deferred income taxes	41	59
Goodwill	593	602
Other intangibles, net	344	343
Other non-current assets	157	105
Intercompany receivables (payables)	906	824
Investment in subsidiaries	0	0
Total assets exclusive of assets under vehicle programs	3,904	3,748
Assets under vehicle programs:
Program cash	151	283
Vehicles, net	12,067	10,531
Receivables from vehicle manufacturers and other	770	546
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	516	423
Total Assets under vehicle programs	13,504	11,783
Total assets	17,408	15,531
Current liabilities:
Accounts payable and other current liabilities	991	837
Long-term Debt, Current Maturities	4	6
Total current liabilities	995	843
Long-term debt	636	660
Other non-current liabilities	386	378
Due to Related Parties, Noncurrent	1	2
Total liabilities exclusive of liabilities under vehicle programs	2,018	1,883
Liabilities under vehicle programs:
Debt	3,731	2,669
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	7,122	6,480
Deferred income taxes	184	187
Other	310	374
Total Liabilities under vehicle programs	11,347	9,710
Total stockholders' equity	4,043	3,938
Total liabilities and stockholders’ equity	17,408	15,531
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	692	883	981	705
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
Deferred income taxes	0	0
Goodwill	0	0
Other intangibles, net	0	0
Other non-current assets	0	0
Intercompany receivables (payables)	(3,341)	(2,899)
Investment in subsidiaries	(9,239)	(9,000)
Total assets exclusive of assets under vehicle programs	(12,580)	(11,899)
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	(12,580)	(11,899)
Current liabilities:
Accounts payable and other current liabilities	0	0
Long-term Debt, Current Maturities	0	0
Total current liabilities	0	0
Long-term debt	0	0
Other non-current liabilities	0	0
Due to Related Parties, Noncurrent	(3,341)	(2,899)
Total liabilities exclusive of liabilities under vehicle programs	(3,341)	(2,899)
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	(9,239)	(9,000)
Total liabilities and stockholders’ equity	(12,580)	(11,899)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0	$ 0	$ 0	$ 0