Property, Plant And Equipment And Jointly-Owned Facilities (Schedule Of Jointly-Owned Facilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
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

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

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

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

+ References

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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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.

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