Restructuring (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Employee		Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Number of employees terminated during the period	90
Restructuring Charges	$ 7	[1]	$ 10	[2]
Worldwide Restructuring Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees terminated during the period	130
Restructuring Charges	7
Restructuring and Related Cost, Expected Cost	$ 15

[1] (d) During the three months ended March 31, 2014, transaction-related costs primarily comprised of a non-cash charge for re-acquired license rights and acquisition integration expenses. During the three months ended March 31, 2013, transaction-related costs primarily related to the integration of Avis Europe and the acquisition of Zipcar.

[2] (c) Includes unallocated corporate overhead which is not attributable to a particular segment.