Basis of Presentation (Reconciliation of Weighted Average Shares Table) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Weighted average shares used in the basic and diluted net income per common share
Weighted average common shares - basic	387,512,000	399,040,000	387,015,000	398,371,000
Potentially dilutive securities:
Performance equity Awards	78,000	41,000	75,000	22,000
Weighted average common shares - diluted	390,909,000	403,311,000	390,854,000	403,575,000
Stock Option And Stock Appreciation Rights [Member]
Potentially dilutive securities:
Stock options, SARs, and Restricted stock	2,302,000	2,954,000	2,759,000	3,818,000
Restricted stock [Member]
Potentially dilutive securities:
Stock options, SARs, and Restricted stock	1,017,000	1,276,000	1,005,000	1,364,000