Stock Compensation (Summary Of Option Activity During The Period) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Equity [Abstract]
Shares under option at beginning of period | shares	11,653
Shares under option, Granted | shares	2,336
Shares under option, Exercised | shares	(2,031)
Shares under option, Forfeited or expired | shares	(35)
Shares under option at end of period | shares	11,923
Shares under option, Exercisable | shares	6,784
Weighted-average exercise price of Shares under option at beginning of period (in dollars per share) | $ / shares	$ 32.52
Weighted-average exercise price of Shares under option, Granted (in dollars per share) | $ / shares	33.18
Weighted-average exercise price of Shares under option, Exercised (in dollars per share) | $ / shares	30.37
Weighted-average exercise price of Shares under option, Forfeited or expired (in dollars per share) | $ / shares	28.89
Weighted-average exercise price of Shares under option at end of period (in dollars per share) | $ / shares	33.03
Weighted-average exercise price of Shares under option, Exercisable (in dollars per share) | $ / shares	$ 29.92