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Shareholders' Equity Schedule of Common Stock Authorized and Outstanding (Details) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
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Class of Stock [Line Items] |  |
Common stock, shares authorized | 2,000,000,000 | 2,000,000,000
Common stock, shares outstanding | 968,187,955 | 963,335,888
Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Common stock, shares authorized | 2,000,000,000 | 2,000,000,000
Common Stock [Member] | Commonwealth Edison Co [Member] |  |
Class of Stock [Line Items] |  |
Common Stock, Par or Stated Value Per Share | $ 12.50 | $ 12.50
Common stock, shares authorized | 250,000,000 | 250,000,000
Common stock, shares outstanding | 127,021,331 | 127,021,246
Common Stock [Member] | PECO Energy Co [Member] |  |
Class of Stock [Line Items] |  |
Common stock, shares authorized | 500,000,000 | 500,000,000
Common stock, shares outstanding | 170,478,507 | 170,478,507
Common Stock [Member] | Baltimore Gas and Electric Company [Member] |  |
Class of Stock [Line Items] |  |
Common stock, shares authorized | 1,500 | 1,500
Common stock, shares outstanding | 1,000 | 1,000
Common Stock [Member] | Potomac Electric Power Company [Member] |  |
Class of Stock [Line Items] |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares outstanding | 100 | 100
Common Stock [Member] | Delmarva Power & Light Company [Member] |  |
Class of Stock [Line Items] |  |
Common Stock, Par or Stated Value Per Share | $ 2.25 | $ 2.25
Common stock, shares authorized | 1,000 | 1,000
Common stock, shares outstanding | 1,000 | 1,000
Common Stock [Member] | Atlantic City Electric Company [Member] |  |
Class of Stock [Line Items] |  |
Common Stock, Par or Stated Value Per Share | $ 3.00 | $ 3.00
Common stock, shares authorized | 25,000,000 | 25,000,000
Common stock, shares outstanding | 8,546,017 | 8,546,017

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