Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012	$ 13
Restructuring expense	10		7
Cash payment/utilization	13
Balance as of September 30, 2012	10
North America [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012	1
Restructuring expense	3
Cash payment/utilization	(2)
Balance as of September 30, 2012	2
International [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012	12
Restructuring expense	3
Cash payment/utilization	(7)
Balance as of September 30, 2012	8
Truck Rental [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012	0	[1]
Restructuring expense	4
Cash payment/utilization	(4)
Balance as of September 30, 2012	0	[1]
Personnel Related [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012	12
Restructuring expense	5
Cash payment/utilization	9
Balance as of September 30, 2012	8
Facility Related [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012	1
Restructuring expense	1
Cash payment/utilization	0
Balance as of September 30, 2012	2
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	4	[1]
Cash payment/utilization	$ (4)	[1]

[1] Includes expenses related to the disposition of vehicles.