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Jointly Owned Electric Utility Plant (Tables) | 12 Months Ended
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Dec. 31, 2018
Public Utilities, Property, Plant and Equipment [Abstract] |
Schedule of Jointly Owned Utility Plants | Exelon's, Generation's, PECO's, BGE's, Pepco's, DPL's and ACE's undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2018 and 2017 were as follows:
| Nuclear Generation |  | Fossil-Fuel Generation |  | Transmission |  | Other
| Quad Cities |  | Peach Bottom |  | Salem(a) |  | Nine Mile Point Unit 2 |  | Wyman |  | PA(b) |  | NJ/ DE(c) |  | Other(d)
Operator | Generation |  | Generation |  | PSEG Nuclear |  | Generation |  | FP&L |  | First Energy |  | PSEG/ DPL |  | various
Ownership interest | 75.00 | % |  | 50.00 | % |  | 42.59 | % |  | 82.00 | % |  | 5.89 | % |  | various |  |  | various |  |  | various |
Exelon’s share at December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant(e) | $ | 1,131 |  |  | $ | 1,451 |  |  | $ | 648 |  |  | $ | 910 |  |  | $ | 4 |  |  | $ | 28 |  |  | $ | 103 |  |  | $ | 15 |
Accumulated depreciation(e) | 587 |  |  | 523 |  |  | 227 |  |  | 126 |  |  | 3 |  |  | 16 |  |  | 53 |  |  | 13 |
Construction work in progress | 13 |  |  | 15 |  |  | 44 |  |  | 56 |  |  | — |  |  | 1 |  |  | — |  |  | — |
Exelon’s share at December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant(e) | $ | 1,074 |  |  | $ | 1,417 |  |  | $ | 631 |  |  | $ | 839 |  |  | $ | 3 |  |  | $ | 27 |  |  | $ | 102 |  |  | $ | 15 |
Accumulated depreciation(e) | 550 |  |  | 461 |  |  | 205 |  |  | 97 |  |  | 3 |  |  | 15 |  |  | 52 |  |  | 13 |
Construction work in progress | 35 |  |  | 18 |  |  | 33 |  |  | 55 |  |  | — |  |  | — |  |  | — |  |  | — |
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(a) | Generation also owns a proportionate share in the fossil-fuel combustion turbine at Salem, which is fully depreciated. The gross book value was $3 million at December 31, 2018 and 2017.
(b) | PECO, BGE, Pepco, DPL and ACE own a 22%, 7%, 27%, 9% and 8% share, respectively, in 127 miles of 500 kV lines located in Pennsylvania as well as a 20.72%, 10.56%, 9.72%, 3.72% and 3.83% share, respectively, of a 500 kV substation immediately outside of the Conemaugh fossil-generating station which supplies power to the 500 kV lines including, but not limited to, the lines noted above.
(c) | PECO, DPL and ACE own a 42.55%, 1% and 13.9% share, respectively in 151.3 miles of 500 kV lines located in New Jersey and of the Salem generating plant substation. PECO, DPL and ACE also own a 42.55%, 7.45% and 7.45% share, respectively, in 2.5 miles of 500 kV line located over the Delaware River. ACE also has a 21.78% share in a 500 kV New Freedom Switching substation.
(d) | Generation, DPL and ACE own a 44.24%, 11.91% and 4.83% share, respectively in assets located at Merrill Creek Reservoir located in New Jersey. Pepco, DPL and ACE own a 11.9%, 7.4% and 6.6% share, respectively, in Valley Forge Corporate Center.
(e) | Excludes asset retirement costs and general plant.

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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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