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Financing Activities - Short-term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Capacity | $ 2,850 |
Commercial Paper Issuances | 1,530 | $ 1,183
Unused Capacity | $ 1,320 |
PPL Capital Funding [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.88% | 2.82%
Capacity | $ 1,500 |
Commercial Paper Issuances | 968 | $ 669
Unused Capacity | $ 532 |
PPL Electric [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% |
Capacity | $ 650 |
Commercial Paper Issuances | 60 | $ 0
Unused Capacity | 590 |
LGE [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Commercial Paper Issuances | $ 200 |
LGE [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% | 2.94%
Capacity | $ 350 |
Commercial Paper Issuances | 269 | $ 279
Unused Capacity | $ 81 |
KU [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% | 2.94%
Capacity | $ 350 |
Commercial Paper Issuances | 233 | $ 235
Unused Capacity | $ 117 |
PPL Electric Utilities Corp [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% |
Capacity | $ 650 |
Commercial Paper Issuances | 60 | $ 0
Unused Capacity | 590 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Commercial Paper Issuances | $ 200 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% | 2.94%
Capacity | $ 350 |
Commercial Paper Issuances | 269 | $ 279
Unused Capacity | $ 81 |
LG And E And KU Energy LLC [Member] | KU [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% | 2.94%
Capacity | $ 350 |
Commercial Paper Issuances | 233 | $ 235
Unused Capacity | 117 |
Louisville Gas And Electric Co [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Commercial Paper Issuances | $ 200 |
Louisville Gas And Electric Co [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% | 2.94%
Capacity | $ 350 |
Commercial Paper Issuances | 269 | $ 279
Unused Capacity | $ 81 |
Kentucky Utilities Co [Member] | Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.75% | 2.94%
Capacity | $ 350 |
Commercial Paper Issuances | 233 | $ 235
Unused Capacity | $ 117 |

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