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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, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 01, 2015
Claim By Former Affiliate [Abstract] |  |  |  |  |  |  |
Restructuring And Related Activities Ownership Percentage By Riverstone |  |  |  |  |  |  | 35.00%
Power Purchase [Member] |  |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |  |
2022 |  |  |  | $ 33 |  |  |
2023 |  |  |  | 33 |  |  |
2024 |  |  |  | 32 |  |  |
2025 |  |  |  | 32 |  |  |
2026 |  |  |  | 32 |  |  |
Thereafter |  |  |  | 314 |  |  |
Total |  |  |  | 476 |  |  |
Purchases |  |  |  | 19 | $ 18 | $ 22 |
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 |  |  |  |  |  |
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] |  |  |  |  |  |  |
2022 |  |  |  | 23 |  |  |
2023 |  |  |  | 23 |  |  |
2024 |  |  |  | 22 |  |  |
2025 |  |  |  | 22 |  |  |
2026 |  |  |  | 22 |  |  |
Thereafter |  |  |  | 218 |  |  |
Total |  |  |  | 330 |  |  |
Purchases |  |  |  | 13 | 12 | 15 |
Kentucky Utilities Co [Member] | Power Purchase [Member] |  |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |  |
2022 |  |  |  | 10 |  |  |
2023 |  |  |  | 10 |  |  |
2024 |  |  |  | 10 |  |  |
2025 |  |  |  | 10 |  |  |
2026 |  |  |  | 10 |  |  |
Thereafter |  |  |  | 96 |  |  |
Total |  |  |  | 146 |  |  |
Purchases |  |  |  | 6 | 6 | $ 7 |
PPL Electric Additional Sites [Member] | PPL Electric [Member] |  |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  |  |  | 10 | 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 | $ 10 |  |

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