Common Equity (Common Stock And Treasury Stock Shares Activity) (Details) - shares		12 Months Ended
	Dec. 12, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock And Treasury Stock [Roll Forward]
Forward Contract Indexed to Issuer's Equity, Shares		1,300,000
Common Stock [Member]
Common Stock And Treasury Stock [Roll Forward]
Beginning Balance		254,752,788	254,752,788	254,752,788
Forward Contract Indexed to Issuer's Equity, Shares	6,834,221	6,834,221
Ending Balance		261,587,009	254,752,788	254,752,788
Treasury Stock [Member]
Common Stock And Treasury Stock [Roll Forward]
Beginning Balance		74,235,135	75,623,363	76,363,763
Employee Stock-Based Compensation Plans		(1,683,174)	(1,377,363)	(729,073)
Directors' Plan		(21,095)	(10,865)	(11,327)
Ending Balance		72,530,866	74,235,135	75,623,363