Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Supplemental Guarantor Financial Information [Line Items]
Document Fiscal Year Focus	2018
Current assets:
Cash and cash equivalents	$ 489	$ 611	$ 776
Receivables, net	902	922
Other current assets	832	533
Total current assets	2,223	2,066
Property and equipment, net	715	704
Deferred income taxes	1,120	931
Goodwill	1,049	1,073
Other intangibles, net	843	850
Other non-current assets	243	196
Intercompany receivables (payables)	0	0
Investment in subsidiaries	0	0
Total assets exclusive of assets under vehicle programs	6,193	5,820
Assets under vehicle programs:
Program cash	161	283	65
Vehicles, net	13,867	10,626
Receivables from vehicle manufacturers and other	253	547
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	445	423
Total Assets under vehicle programs	14,726	11,879
Total assets	20,919	17,699
Current liabilities:
Accounts payable and other current liabilities	1,832	1,619
Long-term Debt, Current Maturities	24	26
Total current liabilities	1,856	1,645
Long-term debt	3,544	3,573
Other non-current liabilities	745	717
Due to Related Parties, Noncurrent	0	0
Total liabilities exclusive of liabilities under vehicle programs	6,145	5,935
Liabilities under vehicle programs:
Debt	3,511	2,741
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	8,265	6,480
Deferred income taxes	1,727	1,594
Other	899	376
Total Liabilities under vehicle programs	14,402	11,191
Total stockholders' equity	372	573
Total liabilities and stockholders’ equity	20,919	17,699
Restricted Cash and Cash Equivalents	11		7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	661	901	848	$ 720
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	475		652
Assets under vehicle programs:
Program cash	161		65
Liabilities under vehicle programs:
Restricted Cash and Cash Equivalents	11		7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	647		724	705
Parent Company [Member]
Current assets:
Cash and cash equivalents	3	4
Receivables, net	0	0
Other current assets	2	4
Total current assets	5	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)	191	187
Investment in subsidiaries	169	381
Total assets exclusive of assets under vehicle programs	424	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	424	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	39	40
Due to Related Parties, Noncurrent	0	0
Total liabilities exclusive of liabilities under vehicle programs	52	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	372	573
Total liabilities and stockholders’ equity	424	636
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	3	4	3	3
Subsidiaries [Member]
Current assets:
Cash and cash equivalents	11	14
Receivables, net	0	0
Other current assets	114	89
Total current assets	125	103
Property and equipment, net	183	167
Deferred income taxes	887	704
Goodwill	0	0
Other intangibles, net	26	27
Other non-current assets	39	29
Intercompany receivables (payables)	393	382
Investment in subsidiaries	4,595	4,681
Total assets exclusive of assets under vehicle programs	6,248	6,093
Assets under vehicle programs:
Program cash	0	0
Vehicles, net	43	34
Receivables from vehicle manufacturers and other	3	1
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	0	0
Total Assets under vehicle programs	46	35
Total assets	6,294	6,128
Current liabilities:
Accounts payable and other current liabilities	251	207
Long-term Debt, Current Maturities	17	17
Total current liabilities	268	224
Long-term debt	2,900	2,910
Other non-current liabilities	81	83
Due to Related Parties, Noncurrent	2,860	2,515
Total liabilities exclusive of liabilities under vehicle programs	6,109	5,732
Liabilities under vehicle programs:
Debt	16	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	16	15
Total stockholders' equity	169	381
Total liabilities and stockholders’ equity	6,294	6,128
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	11	14	121	12
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	0
Receivables, net	248	255
Other current assets	119	101
Total current assets	367	356
Property and equipment, net	317	321
Deferred income taxes	169	154
Goodwill	471	471
Other intangibles, net	477	480
Other non-current assets	16	16
Intercompany receivables (payables)	1,747	1,506
Investment in subsidiaries	3,900	3,938
Total assets exclusive of assets under vehicle programs	7,464	7,242
Assets under vehicle programs:
Program cash	0	0
Vehicles, net	57	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	57	61
Total assets	7,521	7,303
Current liabilities:
Accounts payable and other current liabilities	664	552
Long-term Debt, Current Maturities	2	3
Total current liabilities	666	555
Long-term debt	3	3
Other non-current liabilities	259	216
Due to Related Parties, Noncurrent	393	382
Total liabilities exclusive of liabilities under vehicle programs	1,321	1,156
Liabilities under vehicle programs:
Debt	52	57
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0	0
Deferred income taxes	1,553	1,407
Other	0	2
Total Liabilities under vehicle programs	1,605	1,466
Total stockholders' equity	4,595	4,681
Total liabilities and stockholders’ equity	7,521	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	475	593
Receivables, net	654	667
Other current assets	597	339
Total current assets	1,726	1,599
Property and equipment, net	215	216
Deferred income taxes	51	59
Goodwill	578	602
Other intangibles, net	340	343
Other non-current assets	142	105
Intercompany receivables (payables)	924	824
Investment in subsidiaries	0	0
Total assets exclusive of assets under vehicle programs	3,976	3,748
Assets under vehicle programs:
Program cash	161	283
Vehicles, net	13,767	10,531
Receivables from vehicle manufacturers and other	250	546
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	445	423
Total Assets under vehicle programs	14,623	11,783
Total assets	18,599	15,531
Current liabilities:
Accounts payable and other current liabilities	904	837
Long-term Debt, Current Maturities	5	6
Total current liabilities	909	843
Long-term debt	641	660
Other non-current liabilities	366	378
Due to Related Parties, Noncurrent	2	2
Total liabilities exclusive of liabilities under vehicle programs	1,918	1,883
Liabilities under vehicle programs:
Debt	3,443	2,669
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	8,265	6,480
Deferred income taxes	174	187
Other	899	374
Total Liabilities under vehicle programs	12,781	9,710
Total stockholders' equity	3,900	3,938
Total liabilities and stockholders’ equity	18,599	15,531
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	647	883	724	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)	(3,255)	(2,899)
Investment in subsidiaries	(8,664)	(9,000)
Total assets exclusive of assets under vehicle programs	(11,919)	(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	(11,919)	(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	(3,255)	(2,899)
Total liabilities exclusive of liabilities under vehicle programs	(3,255)	(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	(8,664)	(9,000)
Total liabilities and stockholders’ equity	(11,919)	(11,899)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0	$ 0	$ 0	$ 0