Stock-Based Compensation (Stock Options Outstanding, Exercisable and Activity) (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Shares
Beginning Balance	3,517,451
Granted	410,001
Exercised	(566,439)
Forfeited/Expired	(42,250)
Ending Balance	3,318,763	3,517,451
Vested or expected to vest, at end of period	3,225,942
Exercisable, at end of period	2,042,184
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 117.16
Granted (in dollars per share)	130.17
Exercised (in dollars per share)	96.64
Forfeited/Expired (in dollars per share)	138.64
Ending Balance (in dollars per share)	122.00	$ 117.16
Vested or expected to vest, at end of period (in dollars per share)	121.44
Exercisable, at end of period (in dollars per share)	$ 110.97
Weighted Average Remaining Contractual Life (in years)
Outstanding	5 years 8 months 12 days	5 years 8 months 12 days
Vested or expected to vest, at end of period	5 years 7 months 6 days
Exercisable, at end of period	4 years 1 month 6 days
Intrinsic Value (in millions)
Outstanding	$ 92
Vested or expected to vest, at end of period	92
Exercisable, at end of period	$ 79