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Commitments and Contingencies (Environmental Matter and Other) (Details) (USD $)
9 Months Ended
Sep. 30, 2013
MW
Integer
Environmental Matters - Domestic - Air - Cross State Air Pollution Rule (formerly Clean Air Transport Rule) and Clean Air Interstate Rule (Numeric) [Abstract]  
Number of phases CSAPR will be implemented 2
Environmental Matters - Domestic - Air - National Ambient Air Quality Standards [Abstract]  
Standard for sulfur dioxide emissions (in hours) 1
Environmental Matters - Domestic - Air - Mercury and Air Toxics (Numeric) [Abstract]  
Period for compliance with final mercury and air toxics standards (in years) 3
Possible period of extension to comply with final mercury and air toxics standards (in years) 1
Number of extension requests received in Kentucky to comply with mercury and air toxics standards 2
Number of plants in Pennsylvania included in extension request to comply with mercury and air toxics standards 1
Carrying value of Corette plant in Montana that is being moved to long-term reserve status $ 67,000,000
Environmental Matters - Domestic - Air - Greenhouse Gas Regulations and Tort Litigation (Numeric) [Abstract]  
Percentage reduction of greenhouse gas emissions below 2005 levels by 2020 17.00%
Estimate of "social cost of carbon" per metric ton prior to 2015 23.80
Estimate of "social cost of carbon" per metric ton in 2015 38
Number of northeastern states that signed a Memorandum of Understanding that established Regional Greenhouse Gas Initiative 10
Minimum capacity of electric power plants that are impacted by Regional Greenhouse Gas Initiative's emissions stabilization program (in MW) 25
Percentage reduction by 2019 in carbon dioxide emissions under Regional Greenhouse Gas Initiative 10.00%
Maximum percentage reduction in greenhouse gas emissions by implementing actions identified in a Pennsylvania 2009 report 30.00%
Proposed mandatory percentage improvement at power plants 5.00%
Number of electric utility companies affected by a September 2009 U.S. Court of Appeals for the Second Circuit decision 5
Number of companies cited in May 2011 Mississippi court filing 87
Number of indirect subsidaries cited in a May 2011 Mississippi court filing 3
Environmental Matters - Domestic - Air - Renewable Energy Legislation (Numeric) [Abstract]  
Proposed amount of funding for solar projects 25,000,000
Environmental Matters - Domestic - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract]  
Number of approaches proposed by EPA in June 2010 to regulate CCRs 2
Number of companies that have issued an intent to sue against the EPA regarding CCRs 2
Environmental Matters - Domestic - Water/Waste - Seepages and Groundwater Infiltration - Pennsylvania, Montana and Kentucky (Numeric) [Abstract]  
Number of plaintiffs that filed a lawsuit against the Colstrip plant owners in 2007 for seepage issues 6
Period to complete a settlement (in days) 60
Period for PPL Montana to provide financial assurance to Montana Department of Environmental Quality (in years) 5
Environmental Matters - Domestic - Water/Waste - Clean Water Act 316(b) (Numeric) [Abstract]  
Number of requirements under proposed EPA rule regarding reducing impact to aquatic organisms 2
Number of factors to make a site-specific determination 9
Other - Nuclear Insurance (Numeric) [Abstract]  
Maximum amount of insured property damage losses at nuclear station 2,500,000,000
Maximum assessment for retroactive premiums for nuclear outage insurance coverage 46,000,000
Maximum public liability for claims resulting an incident at nuclear station 12,600,000,000
Maximum amount that could be assessed resulting from an incident at nuclear station 235,000,000
Maximum amount payable per year resulting from an incident at nuclear station 35,000,000
PPL Energy Supply LLC [Member]
 
Environmental Matters - Domestic - Air - Cross State Air Pollution Rule (formerly Clean Air Transport Rule) and Clean Air Interstate Rule (Numeric) [Abstract]  
Number of phases CSAPR will be implemented 2
Environmental Matters - Domestic - Air - National Ambient Air Quality Standards [Abstract]  
Standard for sulfur dioxide emissions (in hours) 1
Environmental Matters - Domestic - Air - Mercury and Air Toxics (Numeric) [Abstract]  
Period for compliance with final mercury and air toxics standards (in years) 3
Possible period of extension to comply with final mercury and air toxics standards (in years) 1
Number of plants in Pennsylvania included in extension request to comply with mercury and air toxics standards 1
Carrying value of Corette plant in Montana that is being moved to long-term reserve status 67,000,000
Environmental Matters - Domestic - Air - Greenhouse Gas Regulations and Tort Litigation (Numeric) [Abstract]  
Percentage reduction of greenhouse gas emissions below 2005 levels by 2020 17.00%
Estimate of "social cost of carbon" per metric ton prior to 2015 23.80
Estimate of "social cost of carbon" per metric ton in 2015 38
Number of northeastern states that signed a Memorandum of Understanding that established Regional Greenhouse Gas Initiative 10
Minimum capacity of electric power plants that are impacted by Regional Greenhouse Gas Initiative's emissions stabilization program (in MW) 25
Percentage reduction by 2019 in carbon dioxide emissions under Regional Greenhouse Gas Initiative 10.00%
Maximum percentage reduction in greenhouse gas emissions by implementing actions identified in a Pennsylvania 2009 report 30.00%
Proposed mandatory percentage improvement at power plants 5.00%
Number of electric utility companies affected by a September 2009 U.S. Court of Appeals for the Second Circuit decision 5
Number of companies cited in May 2011 Mississippi court filing 87
Environmental Matters - Domestic - Air - Renewable Energy Legislation (Numeric) [Abstract]  
Proposed amount of funding for solar projects 25,000,000
Environmental Matters - Domestic - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract]  
Number of approaches proposed by EPA in June 2010 to regulate CCRs 2
Number of companies that have issued an intent to sue against the EPA regarding CCRs 2
Environmental Matters - Domestic - Water/Waste - Seepages and Groundwater Infiltration - Pennsylvania, Montana and Kentucky (Numeric) [Abstract]  
Number of plaintiffs that filed a lawsuit against the Colstrip plant owners in 2007 for seepage issues 6
Period to complete a settlement (in days) 60
Period for PPL Montana to provide financial assurance to Montana Department of Environmental Quality (in years) 5
Environmental Matters - Domestic - Water/Waste - Clean Water Act 316(b) (Numeric) [Abstract]  
Number of requirements under proposed EPA rule regarding reducing impact to aquatic organisms 2
Number of factors to make a site-specific determination 9
Other - Nuclear Insurance (Numeric) [Abstract]  
Maximum amount of insured property damage losses at nuclear station 2,500,000,000
Maximum assessment for retroactive premiums for nuclear outage insurance coverage 46,000,000
Maximum public liability for claims resulting an incident at nuclear station 12,600,000,000
Maximum amount that could be assessed resulting from an incident at nuclear station 235,000,000
Maximum amount payable per year resulting from an incident at nuclear station 35,000,000
LG And E And KU Energy LLC [Member]
 
Environmental Matters - Domestic - Air - Cross State Air Pollution Rule (formerly Clean Air Transport Rule) and Clean Air Interstate Rule (Numeric) [Abstract]  
Number of phases CSAPR will be implemented 2
Environmental Matters - Domestic - Air - National Ambient Air Quality Standards [Abstract]  
Standard for sulfur dioxide emissions (in hours) 1
Environmental Matters - Domestic - Air - Mercury and Air Toxics (Numeric) [Abstract]  
Period for compliance with final mercury and air toxics standards (in years) 3
Possible period of extension to comply with final mercury and air toxics standards (in years) 1
Number of extension requests received in Kentucky to comply with mercury and air toxics standards 2
Environmental Matters - Domestic - Air - Greenhouse Gas Regulations and Tort Litigation (Numeric) [Abstract]  
Percentage reduction of greenhouse gas emissions below 2005 levels by 2020 17.00%
Estimate of "social cost of carbon" per metric ton prior to 2015 23.80
Estimate of "social cost of carbon" per metric ton in 2015 38
Number of northeastern states that signed a Memorandum of Understanding that established Regional Greenhouse Gas Initiative 10
Minimum capacity of electric power plants that are impacted by Regional Greenhouse Gas Initiative's emissions stabilization program (in MW) 25
Percentage reduction by 2019 in carbon dioxide emissions under Regional Greenhouse Gas Initiative 10.00%
Number of electric utility companies affected by a September 2009 U.S. Court of Appeals for the Second Circuit decision 5
Number of companies cited in May 2011 Mississippi court filing 87
Number of indirect subsidaries cited in a May 2011 Mississippi court filing 3
Environmental Matters - Domestic - Air - Renewable Energy Legislation (Numeric) [Abstract]  
Proposed amount of funding for solar projects 25,000,000
Environmental Matters - Domestic - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract]  
Number of approaches proposed by EPA in June 2010 to regulate CCRs 2
Number of companies that have issued an intent to sue against the EPA regarding CCRs 2
Environmental Matters - Domestic - Water/Waste - Clean Water Act 316(b) (Numeric) [Abstract]  
Number of requirements under proposed EPA rule regarding reducing impact to aquatic organisms 2
Number of factors to make a site-specific determination 9
Louisville Gas And Electric Co [Member]
 
Environmental Matters - Domestic - Air - Cross State Air Pollution Rule (formerly Clean Air Transport Rule) and Clean Air Interstate Rule (Numeric) [Abstract]  
Number of phases CSAPR will be implemented 2
Environmental Matters - Domestic - Air - National Ambient Air Quality Standards [Abstract]  
Standard for sulfur dioxide emissions (in hours) 1
Environmental Matters - Domestic - Air - Mercury and Air Toxics (Numeric) [Abstract]  
Period for compliance with final mercury and air toxics standards (in years) 3
Possible period of extension to comply with final mercury and air toxics standards (in years) 1
Environmental Matters - Domestic - Air - Greenhouse Gas Regulations and Tort Litigation (Numeric) [Abstract]  
Percentage reduction of greenhouse gas emissions below 2005 levels by 2020 17.00%
Estimate of "social cost of carbon" per metric ton prior to 2015 23.80
Estimate of "social cost of carbon" per metric ton in 2015 38
Number of northeastern states that signed a Memorandum of Understanding that established Regional Greenhouse Gas Initiative 10
Minimum capacity of electric power plants that are impacted by Regional Greenhouse Gas Initiative's emissions stabilization program (in MW) 25
Percentage reduction by 2019 in carbon dioxide emissions under Regional Greenhouse Gas Initiative 10.00%
Number of electric utility companies affected by a September 2009 U.S. Court of Appeals for the Second Circuit decision 5
Number of companies cited in May 2011 Mississippi court filing 87
Environmental Matters - Domestic - Air - Renewable Energy Legislation (Numeric) [Abstract]  
Proposed amount of funding for solar projects 25,000,000
Environmental Matters - Domestic - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract]  
Number of approaches proposed by EPA in June 2010 to regulate CCRs 2
Number of companies that have issued an intent to sue against the EPA regarding CCRs 2
Environmental Matters - Domestic - Water/Waste - Clean Water Act 316(b) (Numeric) [Abstract]  
Number of requirements under proposed EPA rule regarding reducing impact to aquatic organisms 2
Number of factors to make a site-specific determination 9
Kentucky Utilities Co [Member]
 
Environmental Matters - Domestic - Air - Cross State Air Pollution Rule (formerly Clean Air Transport Rule) and Clean Air Interstate Rule (Numeric) [Abstract]  
Number of phases CSAPR will be implemented 2
Environmental Matters - Domestic - Air - National Ambient Air Quality Standards [Abstract]  
Standard for sulfur dioxide emissions (in hours) 1
Environmental Matters - Domestic - Air - Mercury and Air Toxics (Numeric) [Abstract]  
Period for compliance with final mercury and air toxics standards (in years) 3
Possible period of extension to comply with final mercury and air toxics standards (in years) 1
Environmental Matters - Domestic - Air - Greenhouse Gas Regulations and Tort Litigation (Numeric) [Abstract]  
Percentage reduction of greenhouse gas emissions below 2005 levels by 2020 17.00%
Estimate of "social cost of carbon" per metric ton prior to 2015 23.80
Estimate of "social cost of carbon" per metric ton in 2015 38
Number of northeastern states that signed a Memorandum of Understanding that established Regional Greenhouse Gas Initiative 10
Minimum capacity of electric power plants that are impacted by Regional Greenhouse Gas Initiative's emissions stabilization program (in MW) 25
Percentage reduction by 2019 in carbon dioxide emissions under Regional Greenhouse Gas Initiative 10.00%
Number of electric utility companies affected by a September 2009 U.S. Court of Appeals for the Second Circuit decision 5
Number of companies cited in May 2011 Mississippi court filing 87
Environmental Matters - Domestic - Air - Renewable Energy Legislation (Numeric) [Abstract]  
Proposed amount of funding for solar projects $ 25,000,000
Environmental Matters - Domestic - Water/Waste - Coal Combustion Residuals (Numeric) [Abstract]  
Number of approaches proposed by EPA in June 2010 to regulate CCRs 2
Number of companies that have issued an intent to sue against the EPA regarding CCRs 2
Environmental Matters - Domestic - Water/Waste - Clean Water Act 316(b) (Numeric) [Abstract]  
Number of requirements under proposed EPA rule regarding reducing impact to aquatic organisms 2
Number of factors to make a site-specific determination 9