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Property, Plant And Equipment And Jointly-Owned Facilities (Schedule Of Jointly-Owned Facilities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Conemaugh [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 23.00% |
Plant | $ 408 | $ 408
Accumulated Depreciation | $ 178 | 166
Keystone [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 23.00% |
Plant | $ 409 | 409
Accumulated Depreciation | $ 187 | 176
Peach Bottom [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 50.00% |
Peach Bottom [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 50.00% |
Plant | $ 1,328 | 1,272
Accumulated Depreciation | $ 348 | 306
Salem [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 57.00% |
Salem [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 57.00% |
Plant | $ 1,147 | 1,077
Accumulated Depreciation | 277 | 304
Nuclear Support Facilities [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Plant | 239 | 238
Accumulated Depreciation | $ 81 | 71
Yards Creek [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 50.00% |
Plant | $ 44 | 42
Accumulated Depreciation | $ 26 | 25
Merrill Creek Reservoir [Member] | Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Ownership Interest | 14.00% |
Plant | $ 1 | 1
Accumulated Depreciation | 0 | 0
Transmission Facilities [Member] | PSE&G [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Plant | 162 | 169
Accumulated Depreciation | $ 58 | $ 65

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + 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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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + 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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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + 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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- 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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