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

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

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

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Claim By Former Affiliate [Abstract]

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Initial ownership percentage in new company, Talen Energy, by Riverstone Holdings, LLC upon completion of spinoff transaction.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract).

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Commitments and Contingencies (Energy Purchases, Energy Sales, Other Commitments and Legal Matters) (Details) $ in Millions	1 Months Ended			12 Months Ended
	Jun. 30, 2017 mi	Jul. 31, 2014 claim	Dec. 31, 2013 resident	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 01, 2015
Claim By Former Affiliate [Abstract]
Restructuring And Related Activities Ownership Percentage By Riverstone							35.00%
LKE [Member] \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2021				$ 34
2022				34
2023				34
2024				32
2025				32
Thereafter				359
Total				525
Purchases				18	$ 22	$ 20
LGE [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of residents that filed class action suit \| resident			6
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling \| claim		1
LGE [Member] \| Minimum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents \| mi	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 \| mi	3
LG And E And KU Energy LLC [Member] \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2021				34
2022				34
2023				34
2024				32
2025				32
Thereafter				359
Total				525
Purchases				18	22	20
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 remaining unresolved Clean Air Act violation claims after July 2014 court ruling \| claim		1
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 \| mi	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 \| mi	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 remaining unresolved Clean Air Act violation claims after July 2014 court ruling \| claim		1
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 \| mi	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 \| mi	3
Louisville Gas And Electric Co [Member] \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2021				23
2022				23
2023				24
2024				22
2025				22
Thereafter				250
Total				364
Purchases				12	15	14
Kentucky Utilities Co [Member] \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2021				11
2022				11
2023				10
2024				10
2025				10
Thereafter				109
Total				161
Purchases				6	7	$ 6
PPL Electric Additional Sites [Member] \| PPL Electric [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies				$ 10
PPL Electric Additional Sites [Member] \| PPL Electric Utilities Corp [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies					$ 10