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Common Equity (Common Share Activity) (Details)	9 Months Ended
Common Equity (Common Share Activity) (Details)	Sep. 30, 2013
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1 (in shares)	110,987,400
Equity-based compensation plans (in shares)	(23,374)
Other (in shares)	(20,357)
Shares outstanding, September 30 (in shares)	110,943,669

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Number of shares issued during the period as a result of an employee stock purchase plan.