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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |
Maximum Program Size | $ 9,704 | [1]
Line of Credit Facility, Capacity Available for Trade Purchases | 7,687 |
Revolving Credit Facility [Member] | Exelon Corporate [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum Program Size | 600 | [1]
Line of Credit Facility, Capacity Available for Trade Purchases | 591 |
Corporate, Non-Segment [Member] | Exelon Corporate [Member] |  |
Line of Credit Facility [Line Items] |  |
Short-term Bank Loans and Notes Payable | $ 500 |
Debt Instrument, Interest Rate Terms | LIBOR plus 1% |
[1] | Excludes $135 million of credit facility agreements arranged at minority and community banks at Generation, ComEd, PECO, BGE, Pepco, DPL and ACE with aggregate commitments of $49 million, $33 million, $34 million, $5 million, $5 million, $5 million and $5 million, respectively. These facilities expire on October 11, 2019. These facilities are solely utilized to issue letters of credit. As of December 31, 2018, letters of credit issued under these facilities totaled $5 million and $2 million for Generation and BGE, respectively.

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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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