Common Equity (Common Share Activity) (Details)	9 Months Ended
	Sep. 30, 2015 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2015 (in shares)	110,935,680
New shares of stock issued, Shareowner Direct Plan (in shares)	204,213
Equity-based compensation plans (in shares)	56,378
Other (in shares)	(22,463)
Shares outstanding, September 30, 2015 (in shares)	113,360,425
At The Market Offering Program [Member]
Common Stock Oustanding [Roll Forward]
New shares of common stock issued, At-the-market offering program (in shares)	2,186,617