Stock-Based Compensation (Options Granted To Executives, Non-Executives And Directors That Are Vested And Expected To Vest) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Number of Shares - Vested and Expected to Vest	5,124,408
Weighted Average Exercise Price - Vested and Expected to Vest	$ 42.80
Weighted Average Remaining Contractual Life (in years) - Vested and Expected to Vest	5.15
Aggregate Intrinsic Value - Vested and Expected to Vest
Executives [Member]
Number of Shares - Vested and Expected to Vest	3,768,854
Weighted Average Exercise Price - Vested and Expected to Vest	$ 43.89
Directors [Member]
Number of Shares - Vested and Expected to Vest	1,047,912
Weighted Average Exercise Price - Vested and Expected to Vest	$ 39.88
Non-Executives [Member]
Number of Shares - Vested and Expected to Vest	307,642
Weighted Average Exercise Price - Vested and Expected to Vest	$ 39.43