Acquisitions, Development and Divestures (Details) (USD $)
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12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||
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Dec. 31, 2013
MW
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Cane Run Unit 7 [Member]
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Dec. 31, 2013
Cane Run And Green River Plants [Member]
Integer
MW
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Dec. 31, 2013
Tyrone Plant [Member]
MW
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Dec. 31, 2013
Haefling Plant [Member]
MW
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Dec. 31, 2013
Future Capacity [Member]
MW
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Dec. 31, 2013
Green River Plant [Member]
MW
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Dec. 31, 2013
Solar Generation Facility [Member]
MW
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Dec. 31, 2013
Holtwood Hydroelectric Plant Expansion [Member]
MW
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Jan. 31, 2014
Rainbow Hydroelectric Plant Expansion [Member]
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Dec. 31, 2013
Rainbow Hydroelectric Plant Expansion [Member]
MW
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Dec. 31, 2013
Proposed Bell Bend Nuclear Unit [Member]
Integer
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Dec. 31, 2012
Proposed Bell Bend Nuclear Unit [Member]
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Dec. 31, 2013
Susquehanna Roseland Transmission Line [Member]
mi
kV
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Dec. 31, 2013
Northeast Pocono Reliability Project [Member]
mi
Integer
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Dec. 31, 2013
PPL Energy Supply LLC [Member]
MW
Integer
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Dec. 31, 2012
PPL Energy Supply LLC [Member]
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Dec. 31, 2011
PPL Energy Supply LLC [Member]
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Dec. 31, 2013
PPL Energy Supply LLC [Member]
Holtwood Hydroelectric Plant Expansion [Member]
MW
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Jan. 31, 2014
PPL Energy Supply LLC [Member]
Rainbow Hydroelectric Plant Expansion [Member]
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Dec. 31, 2013
PPL Energy Supply LLC [Member]
Rainbow Hydroelectric Plant Expansion [Member]
MW
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Dec. 31, 2013
PPL Energy Supply LLC [Member]
Proposed Bell Bend Nuclear Unit [Member]
Integer
|
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Proposed Bell Bend Nuclear Unit [Member]
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Dec. 31, 2013
PPL Energy Supply LLC [Member]
Susquehanna Roseland Transmission Line [Member]
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Jan. 31, 2014
PPL Electric Utilities Corp [Member]
Rainbow Hydroelectric Plant Expansion [Member]
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Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Susquehanna Roseland Transmission Line [Member]
mi
kV
|
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Northeast Pocono Reliability Project [Member]
Integer
mi
|
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Cane Run Unit 7 [Member]
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Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Cane Run And Green River Plants [Member]
MW
Integer
|
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Tyrone Plant [Member]
MW
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Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Haefling Plant [Member]
MW
|
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Future Capacity [Member]
MW
|
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Green River Plant [Member]
MW
|
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Solar Generation Facility [Member]
MW
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Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Cane Run Unit 7 [Member]
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Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Cane Run And Green River Plants [Member]
Integer
MW
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Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Green River Plant [Member]
MW
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Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Solar Generation Facility [Member]
MW
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Dec. 31, 2013
Kentucky Utilities Co [Member]
Cane Run Unit 7 [Member]
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Dec. 31, 2013
Kentucky Utilities Co [Member]
Cane Run And Green River Plants [Member]
MW
Integer
|
Dec. 31, 2013
Kentucky Utilities Co [Member]
Tyrone Plant [Member]
MW
|
Dec. 31, 2013
Kentucky Utilities Co [Member]
Haefling Plant [Member]
MW
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Dec. 31, 2013
Kentucky Utilities Co [Member]
Green River Plant [Member]
MW
|
Dec. 31, 2013
Kentucky Utilities Co [Member]
Solar Generation Facility [Member]
MW
|
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Development Projects [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
Planned capacity expansion (in MW) | 700 | 700 | 10 | 700 | 700 | 10 | 700 | 10 | 700 | 10 | ||||||||||||||||||||||||||||||||||||
Completed capacity expansion (in MW) | 125 | 63 | 125 | 63 | ||||||||||||||||||||||||||||||||||||||||||
Expected capital cost of an expansion project | $ 600,000,000 | $ 700,000,000 | $ 36,000,000 | $ 335,000,000 | $ 335,000,000 | $ 600,000,000 | $ 700,000,000 | $ 36,000,000 | $ 600,000,000 | $ 700,000,000 | $ 36,000,000 | $ 600,000,000 | $ 700,000,000 | $ 36,000,000 | ||||||||||||||||||||||||||||||||
Ownership percentage in a jointly owned plant | 22.00% | 40.00% | 36.00% | 78.00% | 60.00% | 64.00% | ||||||||||||||||||||||||||||||||||||||||
Number of plants anticipated to retire based on stricter EPA regulations or new construction | 5 | 5 | 5 | 5 | ||||||||||||||||||||||||||||||||||||||||||
Capacity of plants anticipated to be retired (in MW) | 724 | 724 | 724 | 724 | ||||||||||||||||||||||||||||||||||||||||||
Capacity of plants retired (in MW) | 71 | 12 | 71 | 12 | 71 | 12 | ||||||||||||||||||||||||||||||||||||||||
Cumulative deferred investments tax credits recorded | 60,000,000 | 117,000,000 | 60,000,000 | 117,000,000 | 60,000,000 | |||||||||||||||||||||||||||||||||||||||||
Treasury grants approved, accepted and to be received in lieu of tax credits | 56,000,000 | 56,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Cumulative deferred investments tax credits to be recaptured | 60,000,000 | 60,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Number of applicants still active in DOE nuclear guarantee program | 8 | 8 | ||||||||||||||||||||||||||||||||||||||||||||
Number of applicants that submitted loan guarantees to the DOE | 10 | 10 | ||||||||||||||||||||||||||||||||||||||||||||
Current appropriated federal loan guarantees for nuclear projects | 18,500,000,000 | 18,500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Maximum number of projects the DOE is expected to finance | 3 | 3 | ||||||||||||||||||||||||||||||||||||||||||||
Amount currently authorized by Board of Directors to spend on Bell Bend COLA | 224,000,000 | 224,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Capitalized costs associated with licensing efforts | 173,000,000 | 154,000,000 | 173,000,000 | 154,000,000 | ||||||||||||||||||||||||||||||||||||||||||
Total length (in miles) of the expansion project | 150 | 58 | 150 | 58 | ||||||||||||||||||||||||||||||||||||||||||
Capacity (in kilovolts) of a transmission line | 500 | 230 | 500 | 230 | ||||||||||||||||||||||||||||||||||||||||||
Share of the expected capital cost of an expansion project when the company has a joint ownership interest | 630,000,000 | 630,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Project costs capitalized | 377,000,000 | 377,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Total length (in miles) of the expansion project to be routed through Pennsylvania | 101 | 101 | ||||||||||||||||||||||||||||||||||||||||||||
Number of new substations included in request | 3 | 3 | ||||||||||||||||||||||||||||||||||||||||||||
Adder to the return on equity incentive denied in ratemaking request (in basis points) | 100 | 100 | ||||||||||||||||||||||||||||||||||||||||||||
Zoning petitions to be approved | 2 | 2 | ||||||||||||||||||||||||||||||||||||||||||||
Other - Montana Transactions (Numeric) [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||
Capacity of facilities to be sold (in MW) | 633 | 633 | ||||||||||||||||||||||||||||||||||||||||||||
Agreed upon sales price for disposal of hydroelectric facilities owned by PPL Montana | 900,000,000 | 900,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Number of hydroelectric facilities owned by PPL Montana to be sold | 11 | 11 | ||||||||||||||||||||||||||||||||||||||||||||
Loss on lease termination | (697,000,000) | (697,000,000) | ||||||||||||||||||||||||||||||||||||||||||||
Loss on sale-leaseback termination, after-tax | 413,000,000 | 413,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
Payment on lease termination | $ 271,000,000 | $ 271,000,000 |