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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 |
--- | --- | --- | --- | ---
Nov. 30, 2014 USD ($) | Jun. 30, 2017 mi | Jul. 31, 2014 claim | Dec. 31, 2013 resident | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 01, 2015
Claim By Former Affiliate [Abstract] |  |  |  |  |  |  |  |
Restructuring And Related Activities Ownership Percentage By Riverstone |  |  |  |  |  |  |  | 35.00%
Amount Of Alleged Improper Distribution | $ 733 |  |  |  |  |  |  |
LKE [Member] | Power Purchase [Member] |  |  |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |  |  |
2020 |  |  |  |  | $ 31 |  |  |
2021 |  |  |  |  | 31 |  |  |
2022 |  |  |  |  | 31 |  |  |
2023 |  |  |  |  | 31 |  |  |
2024 |  |  |  |  | 31 |  |  |
Thereafter |  |  |  |  | 399 |  |  |
Total |  |  |  |  | 554 |  |  |
Purchases |  |  |  |  | 22 | $ 20 | $ 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] |  |  |  |  |  |  |  |
2020 |  |  |  |  | 31 |  |  |
2021 |  |  |  |  | 31 |  |  |
2022 |  |  |  |  | 31 |  |  |
2023 |  |  |  |  | 31 |  |  |
2024 |  |  |  |  | 31 |  |  |
Thereafter |  |  |  |  | 399 |  |  |
Total |  |  |  |  | 554 |  |  |
Purchases |  |  |  |  | 22 | 20 | 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] |  |  |  |  |  |  |  |
2020 |  |  |  |  | 21 |  |  |
2021 |  |  |  |  | 21 |  |  |
2022 |  |  |  |  | 21 |  |  |
2023 |  |  |  |  | 21 |  |  |
2024 |  |  |  |  | 22 |  |  |
Thereafter |  |  |  |  | 276 |  |  |
Total |  |  |  |  | 382 |  |  |
Purchases |  |  |  |  | 15 | 14 | 14 |
Kentucky Utilities Co [Member] | Power Purchase [Member] |  |  |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |  |  |
2020 |  |  |  |  | 10 |  |  |
2021 |  |  |  |  | 10 |  |  |
2022 |  |  |  |  | 10 |  |  |
2023 |  |  |  |  | 10 |  |  |
2024 |  |  |  |  | 9 |  |  |
Thereafter |  |  |  |  | 123 |  |  |
Total |  |  |  |  | 172 |  |  |
Purchases |  |  |  |  | 7 | 6 | $ 6 |
PPL Electric Additional Sites [Member] | PPL Electric [Member] |  |  |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  |  |  | 10 | 11 |  |
PPL Electric Additional Sites [Member] | PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  |  |  | $ 10 | $ 11 |  |

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