Common Equity (Common Share Activity) (Details)	9 Months Ended
	Sep. 30, 2019 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2019 (in shares)	236,063,279
Shareowner Direct Plan (in shares)	390,630
Equity-based compensation plans (in shares)	101,478
Other (in shares)	(2,738)
Shares outstanding, September 30, 2019 (in shares)	240,342,949
Equity Forward Agreements [Member]
Common Stock Oustanding [Roll Forward]
Equity forward agreements (in shares)	3,790,300