Stockholders' Equity (Reconciliation of Common Stock Share Activity) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity Note [Abstract]
Common stock, beginning balance	1,004,351,000	990,855,000	989,415,000
Common stock, issued	22,650,000	18,891,000	1,440,000
Common stock, retired	(13,837,000)	(5,395,000)
Common stock, ending balance	1,013,164,000	1,004,351,000	990,855,000
Held in treasury, beginning balance	(87,041,000)	(87,041,000)	(87,041,000)
Held in treasury, repurchased	(13,837,000)	(5,395,000)
Held in treasury, retired	13,837,000	5,395,000
Held in treasury, ending balance	(87,041,000)	(87,041,000)	(87,041,000)