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Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 29, 2018 USD ($) | Mar. 31, 2019 claim resident coal-fired_unit mi | Jun. 01, 2015
Claim By Former Affiliate [Abstract] |  |  |
Percent of ownership of Talen Energy by Riverstone |  |  | 35.00%
Amount of alleged improper distribution | $ | $ 733 |  |
LGE [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of residents that filed class action suit | resident |  | 6 |
Number of miles within plant that would include a class of residents |  | 4 |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  | 1 |
Generating units retired at the Cane Run plant | coal-fired_unit |  | 3 |
LGE [Member] | Minimum [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of miles within plant that would include a class of residents |  | 1 |
LGE [Member] | Maximum [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of miles within plant that would include a class of residents |  | 3 |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of residents that filed class action suit | resident |  | 6 |
Number of miles within plant that would include a class of residents |  | 4 |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  | 1 |
Generating units retired at the Cane Run plant | coal-fired_unit |  | 3 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Minimum [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of miles within plant that would include a class of residents |  | 1 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Maximum [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of miles within plant that would include a class of residents |  | 3 |
Louisville Gas And Electric Co [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of residents that filed class action suit | resident |  | 6 |
Number of miles within plant that would include a class of residents |  | 4 |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  | 1 |
Generating units retired at the Cane Run plant | coal-fired_unit |  | 3 |
Louisville Gas And Electric Co [Member] | Minimum [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of miles within plant that would include a class of residents |  | 1 |
Louisville Gas And Electric Co [Member] | Maximum [Member] |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |
Number of miles within plant that would include a class of residents |  | 3 |

X
- Definition The amount of the alleged improper distribution of the proceeds from the November 2014 sale of Talen Montana's (then PPL Montana's) hydroelectric generating facilities to PPL's subsidiaries. + References No definition available. + Details
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X
- Definition The number of miles surrounding the plant that a class of plaintiffs could include in a class action suit. + References No definition available. + Details
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency at the Can Run plant. + References No definition available. + Details
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- Definition The number of Clean Air Act violation claims that remains unresolved after a July 2014 court ruling. + References No definition available. + Details
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- Definition Claim By Former Affiliate [Abstract] + References No definition available. + Details
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- Definition The number of coal-fired generating units retired at the Cane Run plant. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Initial ownership percentage in new company, Talen Energy, by Riverstone Holdings, LLC upon completion of spinoff transaction. + References No definition available. + Details
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- Details
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