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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Outstanding Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 34,911 | $ 33,657 |
Unamortized debt discount and premium, net |  | (66) | (57) |
Unamortized debt issuance costs |  | 216 | 201 |
Long-term debt |  | 34,075 | 32,176 |
Junior Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 1,150 | $ 1,150 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.497% | 2.50%
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 11,285 | $ 11,285 |
Maximum [Member] | Junior Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.50% |  |
Maximum [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.60% |  |
Minimum [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.45% |  |
Exelon Corporate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 7,039 | 7,039 |
Unamortized debt discount and premium, net |  | (7) | (8) |
Unamortized debt issuance costs |  | (47) | (49) |
Fair value adjustment of consolidated subsidiary |  | 162 | 179 |
Long-term debt |  | 7,147 | 7,161 |
Exelon Corporate [Member] | Junior Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 1,150 | 1,150 |
Exelon Corporate [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | [1] | $ 5,889 | $ 5,889 |
Exelon Corporate [Member] | Maximum [Member] | Junior Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.50% |  |
Exelon Corporate [Member] | Maximum [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] | 7.60% |  |
Exelon Corporate [Member] | Minimum [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] | 2.45% |  |
[1] | Senior unsecured notes include mirror debt that is held on both Generation and Exelon Corporation's balance sheets.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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