Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Supplemental Guarantor Financial Information [Line Items]
Document Fiscal Year Focus	2018
Current assets:
Cash and cash equivalents	$ 544	$ 611	$ 923
Receivables, net	880	922
Other current assets	699	533
Total current assets	2,123	2,066
Property and equipment, net	716	704
Deferred income taxes	967	931
Goodwill	1,085	1,073
Other intangibles, net	849	850
Other non-current assets	226	196
Intercompany receivables (payables)	0	0
Investment in subsidiaries	0	0
Total assets exclusive of assets under vehicle programs	5,966	5,820
Assets under vehicle programs:
Program cash	147	283	142
Vehicles, net	12,354	10,626
Receivables from vehicle manufacturers and other	332	547
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	423	423
Total Assets under vehicle programs	13,256	11,879
Total assets	19,222	17,699
Current liabilities:
Accounts payable and other current liabilities	1,777	1,619
Long-term Debt, Current Maturities	26	26
Total current liabilities	1,803	1,645
Long-term debt	3,581	3,573
Other non-current liabilities	763	717
Due to Related Parties, Noncurrent	0	0
Total liabilities exclusive of liabilities under vehicle programs	6,147	5,935
Liabilities under vehicle programs:
Debt	2,628	2,741
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	7,754	6,480
Deferred income taxes	1,567	1,594
Other	671	376
Total Liabilities under vehicle programs	12,620	11,191
Total stockholders' equity	455	573
Total liabilities and stockholders’ equity	19,222	17,699
Restricted Cash and Cash Equivalents	10		5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	701	901	1,070	$ 720
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	518		641
Assets under vehicle programs:
Program cash	147		142
Liabilities under vehicle programs:
Restricted Cash and Cash Equivalents	10		5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	675		788	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)	192	187
Investment in subsidiaries	252	381
Total assets exclusive of assets under vehicle programs	508	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	508	636
Current liabilities:
Accounts payable and other current liabilities	14	23
Long-term Debt, Current Maturities	0	0
Total current liabilities	14	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	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	455	573
Total liabilities and stockholders’ equity	508	636
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	3	4	2	3
Subsidiaries [Member]
Current assets:
Cash and cash equivalents	23	14
Receivables, net	0	0
Other current assets	102	89
Total current assets	125	103
Property and equipment, net	176	167
Deferred income taxes	720	704
Goodwill	0	0
Other intangibles, net	27	27
Other non-current assets	37	29
Intercompany receivables (payables)	387	382
Investment in subsidiaries	4,619	4,681
Total assets exclusive of assets under vehicle programs	6,091	6,093
Assets under vehicle programs:
Program cash	0	0
Vehicles, net	46	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	48	35
Total assets	6,139	6,128
Current liabilities:
Accounts payable and other current liabilities	219	207
Long-term Debt, Current Maturities	17	17
Total current liabilities	236	224
Long-term debt	2,902	2,910
Other non-current liabilities	80	83
Due to Related Parties, Noncurrent	2,652	2,515
Total liabilities exclusive of liabilities under vehicle programs	5,870	5,732
Liabilities under vehicle programs:
Debt	17	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	17	15
Total stockholders' equity	252	381
Total liabilities and stockholders’ equity	6,139	6,128
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	23	14	280	12
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	0
Receivables, net	233	255
Other current assets	119	101
Total current assets	352	356
Property and equipment, net	319	321
Deferred income taxes	169	154
Goodwill	471	471
Other intangibles, net	479	480
Other non-current assets	13	16
Intercompany receivables (payables)	1,529	1,506
Investment in subsidiaries	3,948	3,938
Total assets exclusive of assets under vehicle programs	7,280	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	7,337	7,303
Current liabilities:
Accounts payable and other current liabilities	621	552
Long-term Debt, Current Maturities	2	3
Total current liabilities	623	555
Long-term debt	3	3
Other non-current liabilities	259	216
Due to Related Parties, Noncurrent	387	382
Total liabilities exclusive of liabilities under vehicle programs	1,272	1,156
Liabilities under vehicle programs:
Debt	55	57
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	0	0
Deferred income taxes	1,391	1,407
Other	0	2
Total Liabilities under vehicle programs	1,446	1,466
Total stockholders' equity	4,619	4,681
Total liabilities and stockholders’ equity	7,337	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	518	593
Receivables, net	647	667
Other current assets	476	339
Total current assets	1,641	1,599
Property and equipment, net	221	216
Deferred income taxes	65	59
Goodwill	614	602
Other intangibles, net	343	343
Other non-current assets	130	105
Intercompany receivables (payables)	933	824
Investment in subsidiaries	0	0
Total assets exclusive of assets under vehicle programs	3,947	3,748
Assets under vehicle programs:
Program cash	147	283
Vehicles, net	12,251	10,531
Receivables from vehicle manufacturers and other	330	546
Investment in Avis Budget Rental Car Funding (AESOP) LLC—related party	423	423
Total Assets under vehicle programs	13,151	11,783
Total assets	17,098	15,531
Current liabilities:
Accounts payable and other current liabilities	923	837
Long-term Debt, Current Maturities	7	6
Total current liabilities	930	843
Long-term debt	676	660
Other non-current liabilities	385	378
Due to Related Parties, Noncurrent	2	2
Total liabilities exclusive of liabilities under vehicle programs	1,993	1,883
Liabilities under vehicle programs:
Debt	2,556	2,669
Due to Avis Budget Rental Car Funding (AESOP) LLC-related party	7,754	6,480
Deferred income taxes	176	187
Other	671	374
Total Liabilities under vehicle programs	11,157	9,710
Total stockholders' equity	3,948	3,938
Total liabilities and stockholders’ equity	17,098	15,531
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	675	883	788	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)	(3,041)	(2,899)
Investment in subsidiaries	(8,819)	(9,000)
Total assets exclusive of assets under vehicle programs	(11,860)	(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	(11,860)	(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	(3,041)	(2,899)
Total liabilities exclusive of liabilities under vehicle programs	(3,041)	(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	(8,819)	(9,000)
Total liabilities and stockholders’ equity	(11,860)	(11,899)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0	$ 0	$ 0	$ 0