Commitments And Contingent Liabilities (Schedule Of Liability Insurance Coverages) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 mW
Retrospective assessment, power generation, MW	100
Inflation adjustment for assessment, years	5
Property limit in excess	$ 1,250,000,000
Total Site Coverage [Member]
Nuclear Liability, Total	12,594,000,000
Property Damage, Total	2,100,000,000
Replacement Power, Total	1,016,000,000
Retrospective Assessments [Member]
Nuclear Liability, Total	370,000,000
Property Damage, Total	31,000,000
Replacement Power, Total	19,000,000
Power With Exelon Generation [Member]
Blanket limit shared	850,000,000
ANI [Member] | Total Site Coverage [Member]
Public and Nuclear Worker Liability, Primary Layer	375,000,000
ANI [Member] | Retrospective Assessments [Member]
Public and Nuclear Worker Liability, Primary Layer	0
Price-Anderson Act [Member] | Total Site Coverage [Member]
Nuclear Liability, Excess Layer	12,219,000,000
Price-Anderson Act [Member] | Retrospective Assessments [Member]
Nuclear Liability, Excess Layer	370,000,000
NEIL Primary (Salem/Hope Creek/Peach Bottom) [Member] | Total Site Coverage [Member]
Property Damage, Primary Layer	500,000,000
NEIL Primary (Salem/Hope Creek/Peach Bottom) [Member] | Retrospective Assessments [Member]
Property Damage, Primary Layer	18,000,000
NEIL II (Salem/Hope Creek/Peach Bottom) [Member] | Total Site Coverage [Member]
Property Damage, Excess Layers	750,000,000
NEIL II (Salem/Hope Creek/Peach Bottom) [Member] | Retrospective Assessments [Member]
Property Damage, Excess Layers	8,000,000
NEIL Blanket Excess (Salem/Hope Creek/Peach Bottom) [Member] | Total Site Coverage [Member]
Property Damage, Excess Layers	850,000,000
NEIL Blanket Excess (Salem/Hope Creek/Peach Bottom) [Member] | Retrospective Assessments [Member]
Property Damage, Excess Layers	5,000,000
NEIL I (Peach Bottom) [Member]
Indemnity limit on weekly indemnity	2,300,000
Weekly indemnity, time period	52
Indemnity period, after initial period, percentage	80.00%
Indemnity period, after initial period, time period	68
NEIL I (Peach Bottom) [Member] | Total Site Coverage [Member]
Accidental Outage	245,000,000
NEIL I (Peach Bottom) [Member] | Retrospective Assessments [Member]
Accidental Outage	6,000,000
NEIL I (Salem) [Member]
Indemnity limit on weekly indemnity	2,500,000
Weekly indemnity, time period	52
Indemnity period, after initial period, percentage	80.00%
Indemnity period, after initial period, time period	75
NEIL I (Salem) [Member] | Total Site Coverage [Member]
Accidental Outage	281,000,000
NEIL I (Salem) [Member] | Retrospective Assessments [Member]
Accidental Outage	7,000,000
NEIL I (Hope Creek) [Member]
Indemnity limit on weekly indemnity	4,500,000
Weekly indemnity, time period	52
Indemnity period, after initial period, percentage	80.00%
Indemnity period, after initial period, time period	71
NEIL I (Hope Creek) [Member] | Total Site Coverage [Member]
Accidental Outage	490,000,000
NEIL I (Hope Creek) [Member] | Retrospective Assessments [Member]
Accidental Outage	$ 6,000,000