Restructuring (Narrative) (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
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 14	$ 7	$ 39	$ 26
Number of employees terminated during the period			300
Truck Rental [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			19
Restructuring and Related Cost, Expected Cost	3
Worldwide Restructuring Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			20
Restructuring and Related Cost, Expected Cost	$ 18
Number of employees terminated during the period			370