Common Equity (Common Share Activity) (Details)	3 Months Ended
	Mar. 31, 2017 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2017 (in shares)	227,673,654
Shareowner Direct Plan issuances (in shares)	190,286
Equity-based compensation plans (in shares)	5,185
Other (in shares)	(45,847)
Shares outstanding, March 31, 2017 (in shares)	227,823,278