Stock Compensation (Summary Of Option Activity During The Period) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Equity [Abstract]
Shares under option at beginning of period | shares	8,048
Shares under option, Granted | shares	0
Shares under option, Exercised | shares	(1,778)
Shares under option, Forfeited or expired | shares	(1)
Shares under option at end of period | shares	6,269
Shares under option, Exercisable | shares	5,801
Weighted-average exercise price of Shares under option at beginning of period (in dollars per share) | $ / shares	$ 35.20
Weighted-average exercise price of Shares under option, Granted (in dollars per share) | $ / shares	0.00
Weighted-average exercise price of Shares under option, Exercised (in dollars per share) | $ / shares	27.41
Weighted-average exercise price of Shares under option, Forfeited or expired (in dollars per share) | $ / shares	34.52
Weighted-average exercise price of Shares under option at end of period (in dollars per share) | $ / shares	37.40
Weighted-average exercise price of Shares under option, Exercisable (in dollars per share) | $ / shares	$ 37.74