Restructuring (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 10	$ 7
Number of employees terminated during the period	100
Truck Rental [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4
Restructuring and Related Cost, Expected Cost	8
Worldwide Restructuring Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6
Restructuring and Related Cost, Expected Cost	$ 20
Number of employees terminated during the period	150