Commitments And Contingent Liabilities (Nuclear Insurance Coverages and Assessments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 MW
Other Commitments [Line Items]
Retrospective Assessment Power Generation	100
Inflation Adjustment For Assessment Years	5 years
Nuclear Insurance Aggregate Limit	$ 3,200,000,000
Limit Of Liability Per Price Anderson Act	13,600,000,000
Ownership Interest Per Reactor Per Incident	127,000,000
Ownership Interest Payable Per Reactor Per Incident Per Year	19,000,000
Maximum Aggregate Assessment Per Incident	401,000,000
Maximum Aggregate Annual Assessment	60,000,000
Property limit in excess	1,500,000,000
Total Site Coverage [Member]
Other Commitments [Line Items]
Nuclear Liability, Total	13,616,000,000	[1]
Property Damage, Total	2,100,000,000
Replacement Power Total	1,016,000,000
Retrospective Assessments [Member]
Other Commitments [Line Items]
Nuclear Liability, Total	401,000,000
Property Damage, Total	43,000,000
Replacement Power Total	20,000,000
Power With Exelon Generation [Member]
Other Commitments [Line Items]
Blanket limit shared	600,000,000
ANI [Member] | Total Site Coverage [Member]
Other Commitments [Line Items]
Public and Nuclear Worker Liability, Primary Layer	375,000,000	[2]
ANI [Member] | Retrospective Assessments [Member]
Other Commitments [Line Items]
Public and Nuclear Worker Liability, Primary Layer	0
Price-Anderson Act [Member] | Total Site Coverage [Member]
Other Commitments [Line Items]
Nuclear Liability, Excess Layer	13,241,000,000	[3]
Price-Anderson Act [Member] | Retrospective Assessments [Member]
Other Commitments [Line Items]
Nuclear Liability, Excess Layer	401,000,000
NEIL II (Salem/Hope Creek/Peach Bottom) [Member] | Total Site Coverage [Member]
Other Commitments [Line Items]
Property Damage, Primary Layer	1,500,000,000
Property Damage, Excess Layers	600,000,000	[4]
NEIL II (Salem/Hope Creek/Peach Bottom) [Member] | Retrospective Assessments [Member]
Other Commitments [Line Items]
Property Damage, Primary Layer	38,000,000
Property Damage, Excess Layers	5,000,000
NEIL I (Peach Bottom) [Member]
Other Commitments [Line Items]
Indemnity limit on weekly indemnity	2,300,000
Weekly indemnity, time period	364 days
Indemnity period, after initial period, percentage	80.00%
Indemnity period, after initial period, time period	476 days
NEIL I (Peach Bottom) [Member] | Total Site Coverage [Member]
Other Commitments [Line Items]
Accidental Outage	245,000,000	[5]
NEIL I (Peach Bottom) [Member] | Retrospective Assessments [Member]
Other Commitments [Line Items]
Accidental Outage	7,000,000
NEIL I (Salem) [Member]
Other Commitments [Line Items]
Indemnity limit on weekly indemnity	2,500,000
Weekly indemnity, time period	364 days
Indemnity period, after initial period, percentage	80.00%
Indemnity period, after initial period, time period	504 days
NEIL I (Salem) [Member] | Total Site Coverage [Member]
Other Commitments [Line Items]
Accidental Outage	281,000,000	[5]
NEIL I (Salem) [Member] | Retrospective Assessments [Member]
Other Commitments [Line Items]
Accidental Outage	7,000,000
NEIL I (Hope Creek) [Member]
Other Commitments [Line Items]
Indemnity limit on weekly indemnity	4,500,000
Weekly indemnity, time period	364 days
Indemnity period, after initial period, percentage	80.00%
Indemnity period, after initial period, time period	497 days
NEIL I (Hope Creek) [Member] | Total Site Coverage [Member]
Other Commitments [Line Items]
Accidental Outage	490,000,000	[5]
NEIL I (Hope Creek) [Member] | Retrospective Assessments [Member]
Other Commitments [Line Items]
Accidental Outage	$ 6,000,000

[1] Limit of liability under the Price-Anderson Act for each nuclear incident.

[2] The primary limit for Public Liability is a per site aggregate limit with no potential for assessment. The Nuclear Worker Liability represents the potential liability from third party workers claiming exposure to the nuclear energy hazard. This coverage is subject to an industry aggregate limit that is subject to reinstatement at ANI discretion.

[3] Retrospective premium program under the Price-Anderson Act liability provisions of the Atomic Energy Act of 1954, as amended. Power is subject to retrospective assessment with respect to loss from an incident at any licensed nuclear reactor in the United States that produces greater than 100 MW of electrical power. This retrospective assessment can be adjusted for inflation every five years. The last adjustment was effective as of September 10, 2013. The next adjustment is due on or before September 10, 2018. This retrospective program is in excess of the Public and Nuclear Worker Liability primary layers.

[4] For nuclear event property limits in excess of $1.5 billion, Power participates in a $600 million nuclear event Blanket Limit Policy. The blanket limit policy is shared with Exelon Generation and covers the following facilities: Braidwood, Byron, Clinton, Dresden, La Salle, Limerick, Oyster Creek, Quad Cities, TMI-1 Peach Bottom, Salem and Hope Creek. This limit is not subject to reinstatement in the event of a loss. Participation in this program reduces Power’s premium and the associated potential assessment. In addition, for non-nuclear event limits in excess of $1.5 billion, Power maintains a $600 million limit shared by the Salem and Hope Creek facilities. Exelon maintains a $600 million non-nuclear event limit shared by Peach Bottom, Braidwood, Byron, Clinton, Dresden, LaSalle, Limerick, Oyster Creek, Quad Cities, and the TMI-1 facilities.

[5] Peach Bottom 2 and 3 have an aggregate indemnity limit based on a weekly indemnity of $2.3 million for 52 weeks followed by 80% of the weekly indemnity for 68 weeks. Salem 1 and 2 have an aggregate indemnity limit based on a weekly indemnity of $2.5 million for 52 weeks followed by 80% of the weekly indemnity for 76 weeks. Hope Creek has an aggregate indemnity limit based on a weekly indemnity of $4.5 million for 52 weeks followed by 80% of the weekly indemnity for 71 weeks.