Capital Stock and Earnings per Share - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Preferred stock, shares authorized	250
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Options to purchase shares of common stock not included in the computation of diluted earnings per share	3.1	11.9	13.2
Repurchased shares of common stock	9.1
Average price per share	$ 78.88
Total cash outlay	$ 719,000,000	$ 485,600,000	$ 1,050,000,000
Amount authorized for share repurchase program	$ 1,000,000,000