Share-Based Compensation (Information Concerning Currently Outstanding and Exercisable Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Number of options outstanding, in shares	18,615,276
Weighted average remaining life, Outstanding, in years	4.8
Weighted average exercise price, options outstanding, in dollars per share	$ 33.97
Number of options exercisable, in shares	14,007,462
Weighted average remaining life, Exercisable, in years	3.9
Weighted average exercise price, option exercisable, in dollars per share	$ 33.99
$ 0.00 - $10.00 [Member]
Number of options outstanding, in shares	112
Weighted average remaining life, Outstanding, in years	0.1
Weighted average exercise price, options outstanding, in dollars per share	$ 9.98
Number of options exercisable, in shares	112
Weighted average remaining life, Exercisable, in years	0.1
Weighted average exercise price, option exercisable, in dollars per share	$ 9.98
10.01 - 20.00 [Member]
Number of options outstanding, in shares	3,351,200
Weighted average remaining life, Outstanding, in years	4.7
Weighted average exercise price, options outstanding, in dollars per share	$ 16.95
Number of options exercisable, in shares	2,293,386
Weighted average remaining life, Exercisable, in years	4.0
Weighted average exercise price, option exercisable, in dollars per share	$ 17.03
20.01 - 30.00 [Member]
Number of options outstanding, in shares	1,198,010
Weighted average remaining life, Outstanding, in years	3.3
Weighted average exercise price, options outstanding, in dollars per share	$ 24.64
Number of options exercisable, in shares	1,190,010
Weighted average remaining life, Exercisable, in years	3.3
Weighted average exercise price, option exercisable, in dollars per share	$ 24.62
30.01 - 40.00 [Member]
Number of options outstanding, in shares	9,303,154
Weighted average remaining life, Outstanding, in years	4.4
Weighted average exercise price, options outstanding, in dollars per share	$ 35.83
Number of options exercisable, in shares	7,464,759
Weighted average remaining life, Exercisable, in years	3.8
Weighted average exercise price, option exercisable, in dollars per share	$ 36.84
40.01 - 50.00 [Member]
Number of options outstanding, in shares	4,634,428
Weighted average remaining life, Outstanding, in years	5.9
Weighted average exercise price, options outstanding, in dollars per share	$ 44.46
Number of options exercisable, in shares	2,994,195
Weighted average remaining life, Exercisable, in years	4.4
Weighted average exercise price, option exercisable, in dollars per share	$ 43.19
50.01 - 60.00 [Member]
Number of options outstanding, in shares	128,372
Weighted average remaining life, Outstanding, in years	6.0
Weighted average exercise price, options outstanding, in dollars per share	$ 52.26
Number of options exercisable, in shares	65,000
Weighted average remaining life, Exercisable, in years	5.8
Weighted average exercise price, option exercisable, in dollars per share	$ 53.82