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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Short-term Debt [Line Items] |  |
Capacity | $ 2,925 |
Commercial paper issuances | 69 | $ 867
Unused capacity | $ 2,856 |
PPL Capital Funding [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  | 0.25%
Capacity | $ 1,500 |
Commercial paper issuances | 0 | $ 402
Unused capacity | $ 1,500 |
PPL Electric [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  |
Capacity | $ 650 |
Commercial paper issuances | 0 | $ 0
Unused capacity | $ 650 |
LGE [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 0.31% | 0.28%
Capacity | $ 425 |
Commercial paper issuances | 69 | $ 262
Unused capacity | $ 356 |
KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  | 0.28%
Capacity | $ 350 |
Commercial paper issuances | 0 | $ 203
Unused capacity | $ 350 |
PPL Electric Utilities Corp [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  |
Capacity | $ 650 |
Commercial paper issuances | 0 | $ 0
Unused capacity | $ 650 |
Louisville Gas And Electric Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 0.31% | 0.28%
Capacity | $ 425 |
Commercial paper issuances | 69 | $ 262
Unused capacity | $ 356 |
Kentucky Utilities Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  | 0.28%
Capacity | $ 350 |
Commercial paper issuances | 0 | $ 203
Unused capacity | $ 350 |

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