Stock-Based Compensation (Stock Options Outstanding, Exercisable and Activity) (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Beginning Balance	3,371,282
Granted	527,464
Exercised	(510,864)
Forfeited/Expired	(47,480)
Ending Balance	3,340,402	3,371,282
Vested or expected to vest, at end of period	3,245,875
Exercisable, at end of period	1,687,933
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 104.18
Granted (in dollars per share)	136.60
Exercised (in dollars per share)	91.77
Forfeited/Expired (in dollars per share)	120.01
Ending Balance (in dollars per share)	110.98	$ 104.18
Vested or expected to vest, at end of period (in dollars per share)	110.45
Exercisable, at end of period (in dollars per share)	$ 100.46
Weighted Average Remaining Contractual Life (in years)
Outstanding	6 years 1 month 6 days	6 years 2 months 12 days
Vested or expected to vest, at end of period	6 years
Exercisable, at end of period	4 years 1 month 6 days
Intrinsic Value (in millions)
Outstanding	$ 205	$ 135
Vested or expected to vest, at end of period	201
Exercisable, at end of period	121
Employee Stock Option
Number of Shares
Total unrecognized compensation cost that have not yet vested	$ 8
Cost not yet recognized, period for recognition	1 year 6 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost not yet recognized, period for recognition	1 year 6 months