Shareholder Equity Schedule of Common Stock Authorided and Outstanding (Details) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common Stock, Par or Stated Value Per Share	$ 12.50
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common Stock, Shares, Outstanding	919,924,742	859,833,343
Commonwealth Edison Co [Member]
Class of Stock [Line Items]
Common stock, shares authorized	250,000,000
Common Stock, Shares, Outstanding	127,016,973	127,016,947
PECO Energy Co [Member]
Class of Stock [Line Items]
Common stock, shares authorized	500,000,000
Common Stock, Shares, Outstanding	170,478,507	170,478,507
Baltimore Gas and Electric Company [Member]
Class of Stock [Line Items]
Common stock, shares authorized	175,000,000
Common Stock, Shares, Outstanding	1,000	1,000