Property, Plant And Equipment And Jointly-Owned Facilities (Schedule Of Jointly-Owned Facilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Conemaugh [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	23.00%	23.00%
Plant	$ 289	$ 254
Accumulated Depreciation	126	122
Keystone [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	23.00%	23.00%
Plant	381	376
Accumulated Depreciation	117	107
Peach Bottom [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	50.00%	50.00%
Plant	559	399
Accumulated Depreciation	171	149
Salem [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	57.00%	57.00%
Plant	807	770
Accumulated Depreciation	211	225
Nuclear Support Facilities [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest description	Various	Various
Plant	171	135
Accumulated Depreciation	27	21
Yards Creek [Member] | Power [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	50.00%	50.00%
Plant	34	32
Accumulated Depreciation	23	22
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]
Ownership Interest description	Various	Various
Plant	152	148
Accumulated Depreciation	61	61
Linden SNG Plant [Member] | PSE&G [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Ownership Interest	90.00%	90.00%
Plant	5	5
Accumulated Depreciation	$ 5	$ 5