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Common Equity Automatic Dividend Reinvestment and Stock Purchase Plan (Details) - Automatic Dividend Reinvestment and Stock Purchase Plan [Member]
3 Months Ended
Mar. 31, 2016
shares
Stock Issued During Period, Shares, Dividend Reinvestment Plan and Stock Purchase Plan 0
Shares Held in Reserve Related to Dividend Reinvestment Plan and Stock Purchase Plan 4,774,442