Common Equity (Common Share Activity) (Details)	9 Months Ended
	Sep. 30, 2016 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2016 (in shares)	226,918,432	[1]
Shareowner Direct Plan issuances (in shares)	559,588
Equity-based compensation plans (in shares)	22,408
Shares outstanding, September 30, 2016 (in shares)	227,500,428	[1]

[1] Share and per share amounts reflect the effects of a two-for-one common stock split distributed in May 2016.