Share-Based Compensation (Schedule Of Stock Options Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding at beginning of year, number of shares | shares	21,332
Outstanding at beginning of year, weighted-average exercise price | $ / shares	$ 49.40
Granted, number of shares | shares	3,572
Granted, weighted-average exercise price | $ / shares	$ 58.32
Exercised, number of shares | shares	(947)
Exercised, weighted-average exercise price | $ / shares	$ 23.25
Forfeited and expired, number of shares | shares	(156)
Forfeited and expired, weighted-average exercise price | $ / shares	$ 60.75
Outstanding end of year, number of shares | shares	23,801
Outstanding at end of year, weighted-average exercise price | $ / shares	$ 51.71
Outstanding at end of year, aggregate intrinsic value | $	$ 235,909
Outstanding at end of year, weighted-average remaining contractual term	6 years 8 months 3 days
Exercisable at end of year, number of shares | shares	12,287
Exercisable at end of year, weighted-average exercise price | $ / shares	$ 43.77
Exercisable at end of year, aggregate intrinsic value | $	$ 210,966
Exercisable at end of year, weighted-average remaining contractual term	4 years 10 months 1 day