Common Stock - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation, Effect on Earnings Per Share, Basic	$ 0.04	$ 0.04
Share-based compensation, effect on earnings per share, diluted			$ 0.04
Share based compensation	$ 5	$ 5
Weighted average grant-date fair value of options granted	$ 26.46	$ 19.84
Total fair value of shares vested	6	5	6
Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs	9
Unrecognized compensation costs, weighted average period	1 year 7 months 6 days
Cash received from stock option exercises	1	2
Restricted Stock, Restricted Stock Units, Long Term Performance Units, SARs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs	26
Unrecognized compensation costs, weighted average period	2 years 1 month 6 days
Share based compensation	8	5
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs	10
Unrecognized compensation costs, weighted average period	2 years 2 months 12 days
Total fair value of restricted shares vested	7	5
Selling, General and Administrative Expenses [Member] | Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense related to nonqualified stock options	2	2
UNITED STATES | Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cash received from stock option exercises		$ 12