Total Stock Option Activity and Amounts (Detail) (Stock Options, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Stock Options
Share Based Compensation [Line Items]
Number of shares outstanding, beginning balance	6,284,738
Number of shares, granted	843,616
Number of shares, exercised	(1,781,789)
Number of shares, canceled/forfeited	(116,996)
Number of shares outstanding, ending balance	5,229,569
Number of shares, exercisable	3,326,580
Weighted average exercise price, beginning balance	$ 82.83
Weighted average exercise price, granted	$ 134.42
Weighted average exercise price, exercised	$ 76.03
Weighted average exercise price, canceled/forfeited	$ 90.18
Weighted average exercise price, ending balance	$ 93.30
Weighted average exercise price, exercisable	$ 83.19
Weighted average remaining contractual term (years), outstanding, ending balance	6 years 8 months 12 days
Weighted average remaining contractual term (years), exercisable	5 years 3 months 18 days
Aggregate intrinsic value, outstanding, ending balance	$ 214.4
Aggregate intrinsic value, exercisable	$ 168.8