Preferred And Common Stock (Schedule Of Share Activity) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock, beginning balance	119,362,029	122,695,718	124,257,170
Common Stock Outstanding, beginning balance	1,022,025,965	974,378,820	800,317,368
Public offering			172,500,000
Private placement	36,518,563	44,313,146
Conversion of convertible notes		310
Treasury stock, ending balance	113,494,491	119,362,029	122,695,718
Common Stock Outstanding, ending balance	1,064,412,066	1,022,025,965	974,378,820
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued for stock-based compensation plans	(5,867,538)	(3,333,689)	(1,561,452)
Outstanding Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued for stock-based compensation plans	5,867,538	3,333,689	1,561,452