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Debt and Credit Agreements - Summary of Interest Coverage Ratios (Details) | 12 Months Ended
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Dec. 31, 2018
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 7.34
Exelon Generation Co L L C [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 10.99
Commonwealth Edison Co [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 7.34
PECO Energy Co [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 8.14
Baltimore Gas and Electric Company [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 9.77
Potomac Electric Power Company [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 5.98
Delmarva Power & Light Company [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 7.03
Atlantic City Electric Company [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Covenant Compliance | 5.06

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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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