Segment Information (Summary Of Segments Information) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]
Restructuring expense	$ 14		$ 7		$ 39		$ 26
Revenues	2,395		2,170		6,087		5,659
Adjusted EBITDA	369	[1]	370	[1]	615	[2]	736	[2]
Non-vehicle related depreciation and amortization	39		30		109		92
Interest expense	57		67		170		208
Early extinguishment of debt	0		2		131		52
Loss before income taxes	230		260		135		363
Transaction-related costs	10	[3]	11	[3]	37	[4]	21	[4]
Other than Temporary Impairment Losses, Investments	33		0		33		0
North America [Member]
Segment Reporting Information [Line Items]
Restructuring expense					6
Revenues	1,513		1,358		3,905		3,580
Adjusted EBITDA	223		232		427		509
International [Member]
Segment Reporting Information [Line Items]
Restructuring expense					14
Revenues	773		703		1,895		1,791
Adjusted EBITDA	144		129		211		210
Truck Rental [Member]
Segment Reporting Information [Line Items]
Restructuring expense					19
Revenues	109		109		287		287
Adjusted EBITDA	13		14		12		32
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues	0	[5]	0	[5]	0	[5]	1	[5]
Adjusted EBITDA	$ (11)	[5]	$ (5)	[5]	$ (35)	[5]	$ (15)	[5]

[1] Adjusted EBITDA for the three months ended September 30, 2013 and 2012, includes $14 million and $7 million, respectively, of restructuring expense.

[2] Adjusted EBITDA for the nine months ended September 30, 2013 and 2012, includes $39 million and $26 million, respectively, of restructuring expense.

[3] During the three months ended September 30, 2013, the Company incurred $10 million in transaction-related costs related to the integration of the operations of Avis Europe and the acquisition of Payless. During the three months ended September 30, 2012, the Company incurred $11 million in transaction-related costs related to the integration of the operations of Avis Europe.

[4] During the nine months ended September 30, 2013, the Company incurred $37 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 and Payless. During the nine months ended September 30, 2012, the Company incurred $21 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.