Commitments and Contingencies (Environmental Matter and Other) (Details) (USD $)	6 Months Ended
Jun. 30, 2013 MW Integer gal
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
The number of days for designation of non-attainment area to be final after publication	60
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
Carrying value of Corette plant in Montana that is being moved to long-term reserve status	$ 68,000,000
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 - Martins Creek Fly Ash Release (Numeric) [Abstract]
Gallons of water released at the Martins Creek plant in 2005 that contained fly ash	100,000,000
Number of coal-fired generating units at the Martins Creek plant at the time of fly ash release	2
Capacity of each coal-fired generating unit at the Martins Creek plant (in MW)	150
Amounts incurred through period end for remediation and related costs related to 2005 Martins Creek fly ash release	28,000,000
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
The number of days for designation of non-attainment area to be final after publication	60
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
Carrying value of Corette plant in Montana that is being moved to long-term reserve status	68,000,000
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 - Martins Creek Fly Ash Release (Numeric) [Abstract]
Gallons of water released at the Martins Creek plant in 2005 that contained fly ash	100,000,000
Number of coal-fired generating units at the Martins Creek plant at the time of fly ash release	2
Capacity of each coal-fired generating unit at the Martins Creek plant (in MW)	150
Amounts incurred through period end for remediation and related costs related to 2005 Martins Creek fly ash release	28,000,000
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
The number of days for designation of non-attainment area to be final after publication	60
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
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
The number of days for designation of non-attainment area to be final after publication	60
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
The number of days for designation of non-attainment area to be final after publication	60
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

Approximate gallons of water that contained fly ash released at the facility.

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Number of coal combustion residual recycling companies that have filed intents to sue against the environmental protection agency.

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No definition available.

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The period (in years) that a subsidiary is to provide Montana Department of Environmental Quality financial assurance on waste-water treatment facilities per the Administrative Order on Consent.

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No definition available.

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- Definition

The number of factors to consider, including impacts to energy reliability and remaining useful life of plants, when making a site-specific determination using a form of cost-benefit analysis of environmental standards regarding the impact to aquatic organisms of cooling towers.

+ References

No definition available.

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Number of requirements under proposed Environmental Protection Agency rule regarding reducing impact to aquatic organisms of cooling towers.

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No definition available.

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- Definition

The accumulated amount spent through period end for costs arising from performing environmental remediation activities.

+ References

No definition available.

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- Definition

The percentage reduction in greenhouse gas emissions below 2005 levels by 2020 per the Climate Action Plan.

+ References

No definition available.

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The company's maximum amount that could be assessed resulting from an incident at its nuclear station covered by Price-Anderson Act Amendments under the Energy Policy Act of 2005.

+ References

No definition available.

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The company's maximum public liability for claims resulting from an incident at its nuclear station covered by Provisions of The Price-Anderson Act Amendments under the Energy Policy Act of 2005.

+ References

No definition available.

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- Definition

Maximum property insurance coverage for the company's nuclear station.

+ References

No definition available.

+ Details

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Maximum amount payable per year that company would have to pay resulting from an incident at its nuclear station covered by the Price-Anderson Act Amendments under the Energy Policy Act of 2005.

+ References

No definition available.

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- Definition

Maximum assessment of retroactive premiums the company could be assessed in the event of insurers' loss under property and replacement power insurance programs for coverage for the cost of replacement power during prolonged outages of nuclear units under certain specified conditions.

+ References

No definition available.

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- Definition

Capacity of each generating unit at facility where the environmental issue occurred.

+ References

No definition available.

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- Definition

The number, in days, for final designation of a non-attainment area to become final after publication in the Federal Register.

+ References

No definition available.

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- Definition

The number of companies that were cited in a federal district court filing related to a greenhouse gas litigation.

+ References

No definition available.

+ Details

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- Definition

Number of approaches proposed by the EPA in June 2010 to regulate the disposal and management of coal combustion residuals under the Resource Conservation and Recovery Act.

+ References

No definition available.

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- Definition

Number of electric utility companies that could be sued as a result of their greenhouse gas emissions based on a September 2009 U.S. Court of Appeals for the Second Circuit decision.

+ References

No definition available.

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The number of indirect subsidaries that were cited in a federal district court filing related to a greenhouse gas litigation.

+ References

No definition available.

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- Definition

Number of northeastern states that signed a Memorandum of Understanding that established a greenhouse gas emission cap-and-trade program called the Regional Greenhouse Gas Initiative.

+ References

No definition available.

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- Definition

Number of power generating units at the facility where the environmental issue occurred.

+ References

No definition available.

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- Definition

The number of phases that Cross State Air Pollution Rule will be implemented in.

+ References

No definition available.

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- Definition

Percentage reduction by 2019 in carbon dioxide emissions from base 2005 levels under the Regional Greenhouse Gas Initiative's January 2009 program.

+ References

No definition available.

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- Definition

Maximum percentage reduction by 2020 in greenhouse gas emissions that could be achieved by implementing actions identified in Pennsylvania's Advisory Committee's Climate Change Action Report.

+ References

No definition available.

+ Details

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- Definition

Period, in days, that the court granted the motion and ordered the settlement to be returned related to a court case surrounding certain water seepages in Montana.

+ References

No definition available.

+ Details

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- Definition

The carrying value of an asset that is going to be moved to a held and not used status.

+ References

No definition available.

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- Definition

Proposed mandatory percentage improvement in power plant efficiency made by Pennsylvania's Advisory Committee's Climate Change Action Report.

+ References

No definition available.

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- Definition

Amount of proposed funding under a renewable energy program for solar projects.

+ References

No definition available.

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- Definition

Estimate by the United States Government of the "social cost of carbon", per metric ton, in 2015 used to calculate benefits associated with proposed regulations.

+ References

No definition available.

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- Definition

Estimate by the United States Government of the "social cost of carbon", per metric ton, prior to 2015 used to calculate benefits associated with proposed regulations.

+ References

No definition available.

+ Details

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- Definition

Statutory period (after final order) for compliance with mercury and air toxics standards for mercury emissions and other hazardous air pollutants from electric generating units (in years).

+ References

No definition available.

+ Details

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Statutory period, in years, after compliance deadline that an extension to comply with mercury and air toxics standards for mercury emissions and other hazardous air pollutants from electric generating units could be requested.

+ References

No definition available.

+ Details

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- Definition

Standard, in hours, for sulfur dioxide emissions finalized by the EPS.

+ References

No definition available.

+ Details

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- Definition

Minimum capacity (in MW) of electric power plants that are required to stabilize carbon dioxide emissions to base 2005 levels under the Regional Greenhouse Gas Initiative's January 2009 program.

+ References

No definition available.

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- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

No definition available.

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