Common Equity (Common Stock And Treasury Stock Shares Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common Stock [Member]
Common Stock And Treasury Stock [Roll Forward]
Beginning Balance	254,752,788	254,752,788	254,752,788
Ending Balance	254,752,788	254,752,788	254,752,788
Treasury Stock [Member]
Common Stock And Treasury Stock [Roll Forward]
Beginning Balance	76,363,763	75,512,079	76,381,936
Repurchases	0	1,468,984	2,154,490
Employee Stock-Based Compensation Plans	(729,073)	(610,409)	(3,019,475)
Directors' Plan	(11,327)	(6,891)	(4,872)
Ending Balance	75,623,363	76,363,763	75,512,079