Share-Based Compensation - Outstanding and Exercisable Options Ranges (Detail) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	3.1
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 11 months 16 days
Options Outstanding, Weighted Average Exercise Price Per Share (usd per share)	$ 445.09
Options Outstanding, Aggregate Intrinsic Value | $	$ 593,300,000
Options Exercisable, Number of Shares | shares	2.4
Options Exercisable, Weighted Average Remaining Contractual Life	5 years 2 months 22 days
Options Exercisable, Weighted Average Exercise Price Per Share (usd per share)	$ 417.93
Options Exercisable, Aggregate Intrinsic Value | $	$ 516,400,000
Closing stock price (usd per share) | $	$ 634.17
Exercise Price Range 1
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum (usd per share)	$ 95.89
Range of Exercise Prices, maximum (usd per share)	$ 341.19
Options Outstanding, Number of Shares | shares	0.8
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 11 months 19 days
Options Outstanding, Weighted Average Exercise Price Per Share (usd per share)	$ 279.22
Options Exercisable, Number of Shares | shares	0.8
Options Exercisable, Weighted Average Exercise Price Per Share (usd per share)	$ 279.22
Exercise Price Range 2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum (usd per share)	343.83
Range of Exercise Prices, maximum (usd per share)	$ 459.14
Options Outstanding, Number of Shares | shares	0.8
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 9 months 10 days
Options Outstanding, Weighted Average Exercise Price Per Share (usd per share)	$ 416.51
Options Exercisable, Number of Shares | shares	0.6
Options Exercisable, Weighted Average Exercise Price Per Share (usd per share)	$ 410.32
Exercise Price Range 3
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum (usd per share)	466.70
Range of Exercise Prices, maximum (usd per share)	$ 517.31
Options Outstanding, Number of Shares | shares	0.7
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 3 months 14 days
Options Outstanding, Weighted Average Exercise Price Per Share (usd per share)	$ 508.52
Options Exercisable, Number of Shares | shares	0.6
Options Exercisable, Weighted Average Exercise Price Per Share (usd per share)	$ 509.04
Exercise Price Range 4
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum (usd per share)	518.29
Range of Exercise Prices, maximum (usd per share)	$ 614.78
Options Outstanding, Number of Shares | shares	0.6
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 4 months 27 days
Options Outstanding, Weighted Average Exercise Price Per Share (usd per share)	$ 550.88
Options Exercisable, Number of Shares | shares	0.4
Options Exercisable, Weighted Average Exercise Price Per Share (usd per share)	$ 557.95
Exercise Price Range 5
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum (usd per share)	618.96
Range of Exercise Prices, maximum (usd per share)	$ 718.04
Options Outstanding, Number of Shares | shares	0.2
Options Outstanding, Weighted Average Remaining Contractual Life	9 years 7 months 10 days
Options Outstanding, Weighted Average Exercise Price Per Share (usd per share)	$ 685.31
Options Exercisable, Number of Shares | shares	0.0
Options Exercisable, Weighted Average Exercise Price Per Share (usd per share)	$ 692.54