Share-Based Compensation (Schedule Of Stock Options Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Payment Arrangement [Abstract]
Outstanding at beginning of year, number of shares | shares	15,416
Outstanding at beginning of year, weighted-average exercise price | $ / shares	$ 56.36
Granted, number of shares | shares	3
Granted, weighted-average exercise price | $ / shares	$ 72.36
Exercised, number of shares | shares	(4,931)
Exercised, weighted-average exercise price | $ / shares	$ 51.49
Forfeited and expired, number of shares | shares	(284)
Forfeited and expired, weighted-average exercise price | $ / shares	$ 60.98
Outstanding end of year, number of shares | shares	10,204
Outstanding at end of year, weighted-average exercise price | $ / shares	$ 58.59
Outstanding at end of year, aggregate intrinsic value | $	$ 202,938
Outstanding at end of year, weighted-average remaining contractual term	5 years 6 months 21 days
Exercisable at end of year, number of shares | shares	6,437
Exercisable at end of year, weighted-average exercise price | $ / shares	$ 57.23
Exercisable at end of year, aggregate intrinsic value | $	$ 136,811
Exercisable at end of year, weighted-average remaining contractual term	4 years 8 months 19 days