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Shareholders' Equity Shareholder Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Shareholder [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] | The following table presents common stock authorized and outstanding as of December 31, 2018 and 2017:
|  |  |  |  | December 31,
|  |  |  |  | 2018 |  | 2017
| Par Value |  | Shares Authorized |  | Shares Outstanding
Common Stock |  |  |  |  |  |  |
Exelon | no par value |  |  | 2,000,000,000 |  |  | 968,187,955 |  |  | 963,335,888 |
ComEd | $ | 12.50 |  |  | 250,000,000 |  |  | 127,021,331 |  |  | 127,021,246 |
PECO | no par value |  |  | 500,000,000 |  |  | 170,478,507 |  |  | 170,478,507 |
BGE | no par value |  |  | 1,500 |  |  | 1,000 |  |  | 1,000 |
Pepco | $ | 0.01 |  |  | 200,000,000 |  |  | 100 |  |  | 100 |
DPL | $ | 2.25 |  |  | 1,000 |  |  | 1,000 |  |  | 1,000 |
ACE | $ | 3.00 |  |  | 25,000,000 |  |  | 8,546,017 |  |  | 8,546,017 |

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- Definition Shareholder [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration