Stock Option Plans - Stock Options Outstanding and Exercisable (Detail) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 43.71
Range of Exercise Prices, maximum	$ 127.90
Option Outstanding, Number Outstanding	7.5
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 10 months 24 days	3 years 10 months 9 days
Option Outstanding, Weighted Average Exercise Price	$ 81.30	$ 65.09	$ 56.40
Options Exercisable, Number Exercisable	2.1
Option Exercisable, Weighted Average Exercise Price	$ 51.46
Exercise Prices Range $ 43.71 - $ 43.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	43.71
Range of Exercise Prices, maximum	$ 43.71
Option Outstanding, Number Outstanding	0.8
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 2 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 43.71
Options Exercisable, Number Exercisable	0.8
Option Exercisable, Weighted Average Exercise Price	$ 43.71
Exercise Prices Range $ 46.17 - $ 46.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	46.17
Range of Exercise Prices, maximum	$ 46.17
Option Outstanding, Number Outstanding	0.4
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	2 months 8 days
Option Outstanding, Weighted Average Exercise Price	$ 46.17
Options Exercisable, Number Exercisable	0.4
Option Exercisable, Weighted Average Exercise Price	$ 46.17
Exercise Prices Range $ 49.55 - $ 56.86 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	49.55
Range of Exercise Prices, maximum	$ 56.86
Option Outstanding, Number Outstanding	1.0
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 2 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 56.83
Options Exercisable, Number Exercisable	0.6
Option Exercisable, Weighted Average Exercise Price	$ 56.81
Exercise Prices Range $ 70.74 - $ 70.74 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	70.74
Range of Exercise Prices, maximum	$ 70.74
Option Outstanding, Number Outstanding	1.0
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 2 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 70.74
Options Exercisable, Number Exercisable	0.3
Option Exercisable, Weighted Average Exercise Price	$ 70.74
Exercise Prices Range $ 79.59 - $ 79.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	79.59
Range of Exercise Prices, maximum	$ 79.59
Option Outstanding, Number Outstanding	1.2
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 2 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 79.59
Option Exercisable, Weighted Average Exercise Price	79.59
Exercise Prices Range $ 86.17 - $ 86.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	86.17
Range of Exercise Prices, maximum	$ 86.17
Option Outstanding, Number Outstanding	1.5
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 2 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 86.17
Option Exercisable, Weighted Average Exercise Price	86.17
Exercise Prices Range $ 127.90 - $ 127.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	127.90
Range of Exercise Prices, maximum	$ 127.90
Option Outstanding, Number Outstanding	1.6
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 2 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 127.90