Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (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 Reserve [Roll Forward]
Balance as of January 1, 2012				$ 13
Restructuring expense	15		12	25		19
Cash payment/utilization				28
Balance as of September 30, 2012	10			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			2
International [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				12
Restructuring expense				9
Cash payment/utilization				(13)
Balance as of September 30, 2012	8			8
Truck Rental [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				0	[1]
Restructuring expense				13
Cash payment/utilization				(13)
Balance as of September 30, 2012	0	[1]		0	[1]
Personnel Related [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				12
Restructuring expense				11
Cash payment/utilization				15
Balance as of September 30, 2012	8			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			2
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense				13	[1]
Cash payment/utilization				$ (13)	[1]

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