Commitments and Contingencies - Legal Matters and Regulatory Issues (Details)	6 Months Ended
Jun. 30, 2016 Integer claim resident coal-fired_unit mi
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 \| mi	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	1
Additional generating units retired at the Cane Run plant \| coal-fired_unit	2
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	6
Number of miles within plant that would include a class of residents \| mi	4
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling	1
Generating units retired at the Cane Run plant	1
Additional generating units retired at the Cane Run plant	2
Louisville Gas And Electric Co [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of residents that filed class action suit	6
Number of miles within plant that would include a class of residents \| mi	4
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling	1
Generating units retired at the Cane Run plant	1
Additional generating units retired at the Cane Run plant	2

The number of additional coal-fired generating units retired at the Cane Run plant.

No definition available.

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The number of miles surrounding the plant that a class of plaintiffs could include in a class action suit.

No definition available.

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Number of plaintiffs that have filed claims pertaining to a loss contingency at the Can Run plant.

No definition available.

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The number of Clean Air Act violation claims that remains unresolved after a July 2014 court ruling.

No definition available.

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The number of coal-fired generating units retired at the Cane Run plant.

No definition available.

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No definition available.

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