Summary of Changes to Restructuring-Related Liabilities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended					12 Months Ended									12 Months Ended						12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Personnel Related	Dec. 31, 2011 Personnel Related	Dec. 31, 2010 Personnel Related	Dec. 31, 2011 Facility Related	Dec. 31, 2010 Facility Related	Dec. 31, 2012 Facility Related	Dec. 31, 2012 Other		Dec. 31, 2010 Other		Dec. 31, 2009 Other		Dec. 31, 2012 North America	Dec. 31, 2011 North America	Dec. 31, 2010 North America	Dec. 31, 2012 International	Dec. 31, 2011 International	Dec. 31, 2010 International	Dec. 31, 2012 Truck Rental	Dec. 31, 2010 Truck Rental
Restructuring Cost and Reserve [Line Items]
Balance, beginning				$ 2		$ 2	$ 6	$ 5	$ 1		$ 1	$ 6	$ 4	$ 1		[1]		[1]		[1]	$ 1	$ 6	$ 3	$ 1		$ 1		$ 1
Restructuring charge	12	7	12	7	5	38	5	11	37	5	4		7		1	[1]					1	2	11	36	3		1
Acquired restructuring obligation					1		1					1													1
Cash payment/utilization						(27)	(10)	(10)	(26)	(4)	(5)	(6)	(5)		(1)	[1]					(1)	(7)	(8)	(25)	(3)	(1)	(1)	(1)
Balance, ending	$ 13				$ 2	$ 13	$ 2	$ 6	$ 12	$ 1		$ 1	$ 6	$ 1		[1]		[1]		[1]	$ 1	$ 1	$ 6	$ 12	$ 1

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