Common Equity (Common Share Activity) (Details)	3 Months Ended
	Mar. 31, 2016 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2016 (in shares)	113,459,216
Shareowner Direct Plan issuances (in shares)	92,231
Equity-based compensation plans (in shares)	11,204
Shares outstanding, March 31, 2016 (in shares)	113,562,651