Employee Benefit Plans And Other Postretirement Benefits (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 years	Dec. 31, 2010	Jan. 31, 2012	Dec. 31, 2011 Pension And SERPA Benefits [Member]	Dec. 31, 2010 Pension And SERPA Benefits [Member]	Dec. 31, 2009 Pension And SERPA Benefits [Member]	Dec. 31, 2011 Postretirement Healthcare Benefits [Member]	Dec. 31, 2010 Postretirement Healthcare Benefits [Member]	Dec. 31, 2009 Postretirement Healthcare Benefits [Member]	Dec. 31, 2011 SERPA Benefits [Member]	Jan. 31, 2011 SERPA Benefits [Member]	Dec. 31, 2010 SERPA Benefits [Member]	Dec. 31, 2011 401 (K) Plan [Member]	Dec. 31, 2010 401 (K) Plan [Member]	Dec. 31, 2009 401 (K) Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement benefits eligibility, years of service requirement		10
Accumulated benefit obligation					$ 1,460,000,000	$ 1,310,000,000					$ 27,400,000		$ 27,600,000
Projected benefit obligations					1,570,930,000	1,390,374,000	1,284,722,000	380,625,000	378,341,000	377,283,000	41,000,000		38,700,000
Asset allocation in equity securities		70.00%
Asset allocation in debt securities		30.00%
Investment in company common stock - shares			1,273,592
Investment in company common stock - value		49,500,000	44,200,000
Expected return on plan assets	7.80%				8.00%	8.25%	8.25%	8.00%	8.25%	8.25%
Company contributions														12,500,000	12,600,000	3,400,000
Further contributions by company				$ 200,000,000								$ 200,000,000