Property, Plant And Equipment And Jointly-Owned Facilities (Schedule Of Jointly-Owned Facilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Conemaugh [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	23.00%	23.00%
Plant	$ 321	$ 289
Accumulated Depreciation	132	126
Keystone [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	23.00%	23.00%
Plant	387	381
Accumulated Depreciation	128	117
Peach Bottom [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	50.00%	50.00%
Plant	730	559
Accumulated Depreciation	193	171
Salem [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	57.00%	57.00%
Plant	865	807
Accumulated Depreciation	209	211
Nuclear Support Facilities [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Plant	191	171
Accumulated Depreciation	29	27
Yards Creek [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	50.00%	50.00%
Plant	35	34
Accumulated Depreciation	23	23
Merrill Creek Reservoir [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	14.00%	14.00%
Plant	1	1
Accumulated Depreciation	0	0
Transmission Facilities [Member] | PSE&G [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Plant	156	152
Accumulated Depreciation	$ 63	$ 61