Common Equity (Common Share Activity) (Details)	3 Months Ended
	Mar. 31, 2019 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2019 (in shares)	236,063,279
Shareowner Direct Plan issuances (in shares)	142,090
Equity-based compensation plans (in shares)	101,478
Other (in shares)	(2,738)
Shares outstanding, March 31, 2019 (in shares)	237,394,409
Equity Forward Agreements [Member]
Common Stock Oustanding [Roll Forward]
Equity forward agreements (in shares)	1,090,300