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Common Equity (Common Share Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1 (in shares)	245,022,800	236,063,279	231,348,646
Common stock issued during the period, Shareowner Direct Plan (in shares)	472,283	501,808	576,965
Common stock issued during the period, Equity-based compensation plans (in shares)	98,205	101,478	5,078
Common stock issued during the period, Other (in shares)	0	(2,738)	(38,423)
Shares outstanding, December 31 (in shares)	249,868,415	245,022,800	236,063,279
Equity Forward Agreements [Member]
Common Stock Oustanding [Roll Forward]
Common stock issued during the period (in shares)	4,275,127	8,358,973	0
At-the-market Offering Program [Member]
Common Stock Oustanding [Roll Forward]
Common stock issued during the period (in shares)	0	0	4,171,013