Restructuring (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 15	$ 12	$ 25	$ 19
Number of employees terminated during the period			150
Truck Rental [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			13
Restructuring and Related Cost, Expected Cost	9
Worldwide Restructuring Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			12
Restructuring and Related Cost, Expected Cost	$ 22
Number of employees terminated during the period			240