Segment Information (Narrative) (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	$ 2,002,000,000		$ 1,866,000,000		$ 3,693,000,000		$ 3,489,000,000
Adjusted EBITDA	164,000,000	[1]	254,000,000	[1]	247,000,000	[2]	366,000,000	[2]
Non Vehicle Related Depreciation And Amortization	37,000,000		29,000,000		71,000,000		62,000,000
Interest expense	55,000,000		69,000,000		114,000,000		142,000,000
Early Debt Extinguishment	91,000,000		23,000,000		131,000,000		50,000,000
Transaction-related costs	19,000,000	[3]	4,000,000	[3]	26,000,000	[4]	10,000,000	[4]
Restructuring expense	15,000,000		12,000,000		25,000,000		19,000,000
Assets under vehicle programs	12,762,000,000				12,762,000,000				10,099,000,000
Non current deferred tax assets	1,329,000,000				1,329,000,000				1,454,000,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(38,000,000)		129,000,000		(95,000,000)		102,000,000
North America [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	1,292,000,000		1,184,000,000		2,392,000,000		2,222,000,000
Adjusted EBITDA	114,000,000		184,000,000		205,000,000		277,000,000
Restructuring expense					3,000,000
Assets under vehicle programs	9,800,000,000		7,400,000,000		9,800,000,000		7,400,000,000
Segment Assets Exclusive Of Assets Under Vehicle Program	3,600,000,000		3,100,000,000		3,600,000,000		3,100,000,000
International [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	608,000,000		579,000,000		1,123,000,000		1,089,000,000
Adjusted EBITDA	53,000,000		59,000,000		67,000,000		81,000,000
Restructuring expense					9,000,000
Truck Rental [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	102,000,000		103,000,000		178,000,000		177,000,000
Adjusted EBITDA	8,000,000		17,000,000		(2,000,000)		18,000,000
Restructuring expense					13,000,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	0	[5]	0	[5]	0	[5]	1,000,000	[5]
Adjusted EBITDA	$ (11,000,000)	[5]	$ (6,000,000)	[5]	$ (23,000,000)	[5]	$ (10,000,000)	[5]

[1] Adjusted EBITDA for the three months ended June 30, 2013 and 2012, includes $15 million and $12 million, respectively, of restructuring expense.

[2] Adjusted EBITDA for the six months ended June 30, 2013 and 2012, includes $25 million and $19 million, respectively, of restructuring expense.

[3] During the three months ended June 30, 2013, the Company incurred $19 million in transaction-related costs related to the integration of the operations of Avis Europe and costs related to the acquisition and integration of Zipcar. During the three months ended June 30, 2012, the Company incurred $4 million in transaction-related costs related to the integration of the operations of Avis Europe.

[4] During the six months ended June 30, 2013, the Company incurred $26 million in transaction-related costs related to the integration of the operations of Avis Europe and costs related to the acquisition and integration of Zipcar. During the six months ended June 30, 2012, the Company incurred $10 million in transaction-related costs related to the integration of the operations of Avis Europe.

[5] Includes unallocated corporate overhead and the elimination of transactions between segments.