Segment Information (Details Textuals)	9 Months Ended
	Sep. 30, 2013 Regulated Distribution Customers Companies sqmi	Sep. 30, 2013 Competitive Energy Services MW	Sep. 30, 2013 Competitive Energy Services Unregulated Plants Expected to be Closed by 9/1/2012 MW	Oct. 09, 2013 Subsequent Event Regulated Distribution MW	Oct. 09, 2013 Subsequent Event Regulated Distribution Harrison and Pleasants MW
Segment Reporting Information [Line Items]
Number of existing utility operating companies	10
Number of customers served by utility operating companies	6,000,000
Number of square miles in service area	65,000
Megawatts of net demonstrated capacity of competitive segment		15,000		4,000	1,476
Megawatt capacity of plants expected to be closed			885
Plant Capacity Planned for Deactivation		2,080