Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (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 Reserve [Roll Forward]
Balance as of January 1, 2012				$ 13
Restructuring expense	14		7	39		26
Cash payment/utilization				40
Balance as of September 30, 2012	12			12
North America [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				1
Restructuring expense				6
Cash payment/utilization				(4)
Balance as of September 30, 2012	3			3
International [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				12
Restructuring expense				14
Cash payment/utilization				(17)
Balance as of September 30, 2012	9			9
Truck Rental [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				0	[1]
Restructuring expense				19
Cash payment/utilization				(19)
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				18
Cash payment/utilization				19
Balance as of September 30, 2012	11			11
Facility Related [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2012				1
Restructuring expense				2
Cash payment/utilization				2
Balance as of September 30, 2012	1			1
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense				19	[1]
Cash payment/utilization				$ (19)	[1]

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