Common Equity (Common Share Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1 (in shares)	231,348,646	227,673,654	226,918,432
Common stock issued during the period, Shareowner Direct Plan (in shares)	576,965	640,723	732,814
Equity-based compensation plans (in shares)	5,078	5,185	22,408
Other (in shares)	(38,423)	(45,847)	0
Shares outstanding, December 31 (in shares)	236,063,279	231,348,646	227,673,654
At The Market Offering Program [Member]
Common Stock Oustanding [Roll Forward]
Common stock issued during the period, At-the-market offering programs (in shares)	4,171,013	3,074,931	0