Common Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation, Effect on Earnings Per Share, Basic	$ 0.01	$ 0.02	$ 0.05	$ 0.07
Share-based compensation, effect on earnings per share, diluted	$ 0.01	$ 0.02	$ 0.05	$ 0.07
Share based compensation	$ 3	$ 3	$ 11	$ 10
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	4
Weighted average grant-date fair value of options granted			$ 26.48	$ 19.91
Total fair value of shares vested			6	5
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	400,000		400,000
Treasury Stock, Shares, Acquired	2,844,692		2,844,692		0
Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs	7		7
Unrecognized compensation costs, weighted average period			1 year 1 month 6 days
Cash received from stock option exercises			1	13
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	17		17
Unrecognized compensation costs, weighted average period			1 year 9 months 18 days
Share based compensation	1	4	10	14
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs	7		7
Unrecognized compensation costs, weighted average period			1 year 10 months 24 days
Total fair value of restricted shares vested			8	6
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options			18
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	1	1	3	4
UNITED STATES | Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options			$ 14