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Common Equity (Common Share Activity) (Details)
9 Months Ended
Sep. 30, 2018
shares
Common Stock Oustanding [Roll Forward]  
Shares outstanding, January 1, 2018 (in shares) 231,348,646
Shareowner Direct Plan issuances (in shares) 450,133
Equity-based compensation plans (in shares) 5,078
Other (in shares) (38,423)
Shares outstanding, September 30, 2018 (in shares) 235,936,447
At The Market Offering Program [Member]  
Common Stock Oustanding [Roll Forward]  
At-the-market offering program (in shares) 4,171,013