Stock Transactions And Stock-Based Compensation (Summary Of Options Outstanding) (Details) shares in Millions	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Range One
Options, exercise price, lower range limit	$ 38.64
Options, exercise price, upper range limit	$ 62.18
Outstanding, shares (in millions) | shares	1.0
Outstanding, average exercise price	$ 52.21
Outstanding, average remaining life (in years)	2 years
Exercisable, shares (in millions) | shares	1.0
Exercisable, average exercise price	$ 52.21
Range Two
Options, exercise price, lower range limit	62.19
Options, exercise price, upper range limit	$ 80.91
Outstanding, shares (in millions) | shares	2.2
Outstanding, average exercise price	$ 67.02
Outstanding, average remaining life (in years)	4 years
Exercisable, shares (in millions) | shares	2.2
Exercisable, average exercise price	$ 67.02
Range Three
Options, exercise price, lower range limit	80.92
Options, exercise price, upper range limit	$ 100.23
Outstanding, shares (in millions) | shares	4.2
Outstanding, average exercise price	$ 92.60
Outstanding, average remaining life (in years)	5 years
Exercisable, shares (in millions) | shares	2.4
Exercisable, average exercise price	$ 91.21
Range Four
Options, exercise price, lower range limit	100.24
Options, exercise price, upper range limit	$ 163.84
Outstanding, shares (in millions) | shares	5.1
Outstanding, average exercise price	$ 131.98
Outstanding, average remaining life (in years)	7 years
Exercisable, shares (in millions) | shares	1.3
Exercisable, average exercise price	$ 124.92
Range Five
Options, exercise price, lower range limit	163.85
Options, exercise price, upper range limit	$ 299.68
Outstanding, shares (in millions) | shares	3.1
Outstanding, average exercise price	$ 231.03
Outstanding, average remaining life (in years)	9 years
Exercisable, shares (in millions) | shares	0.1
Exercisable, average exercise price	$ 189.56