Common Equity (Common Share Activity) (Details)	3 Months Ended
	Mar. 31, 2015
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)	11,193
Equity-based compensation plans (in shares)	56,378
Other (in shares)	(22,463)
Shares outstanding, March 31, 2015 (in shares)	112,977,238
At The Market Offering Program [Member]
Common Stock Oustanding [Roll Forward]
New shares of common stock issued, At-the-market offering program (in shares)	1,996,450