Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 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
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12	$ 7	$ 12	$ 7	$ 5	$ 38	$ 5	$ 11
Project Grace Worldwide
Restructuring Cost and Reserve [Line Items]
Termination of employment to number of employees						550	50
Worldwide Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges						37	3
Expected additional restructuring costs						20
Five-Point Cost-Reduction And Efficiency Improvement Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges							2	11
Truck Rental
Restructuring Cost and Reserve [Line Items]
Restructuring charges						1
Expected additional restructuring costs						$ 12