Common Equity (Common Stock And Treasury Stock Shares Activity) (Details)					12 Months Ended
	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Dec. 31, 2009 Common Stock [Member]	Dec. 31, 2012 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 31, 2010 Treasury Stock [Member]
Class of Stock and Treasury Stock [Line Items]
Beginning Balance	254,752,788	254,752,788	254,752,788	254,752,788	78,396,988	76,006,920	65,634,580
Repurchases						3,475,000	11,490,551
Employee Stock-Based Compensation Plans					(1,446,305)	(1,079,008)	(1,113,411)
Directors' Plan					(5,444)	(5,924)	(4,800)
Ending Balance	254,752,788	254,752,788	254,752,788	254,752,788	76,945,239	78,396,988	76,006,920