Property, Plant And Equipment And Jointly-Owned Facilities (Schedule Of Jointly-Owned Facilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Conemaugh [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	23.00%
Plant	$ 408	$ 404
Accumulated Depreciation	$ 166	154
Keystone [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	23.00%
Plant	$ 409	408
Accumulated Depreciation	$ 176	163
Peach Bottom [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	50.00%
Plant	$ 1,272	1,219
Accumulated Depreciation	$ 306	262
Salem [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	57.00%
Plant	$ 1,077	990
Accumulated Depreciation	304	276
Nuclear Support Facilities [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Plant	238	226
Accumulated Depreciation	$ 71	60
Yards Creek [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	50.00%
Plant	$ 42	42
Accumulated Depreciation	$ 25	24
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	169	166
Accumulated Depreciation	$ 65	$ 72