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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term Debt [Line Items] |  |
Capacity | $ 2,350 |
Commercial paper issuances | 1,183 | $ 474
Unused capacity | $ 1,167 |
PPL Capital Funding [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 2.82% | 1.64%
Capacity | $ 1,000 |
Commercial paper issuances | 669 | $ 230
Unused capacity | $ 331 |
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 | 2.94% | 1.83%
Capacity | $ 350 |
Commercial paper issuances | 279 | $ 199
Unused capacity | $ 71 |
KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 2.94% | 1.97%
Capacity | $ 350 |
Commercial paper issuances | 235 | $ 45
Unused capacity | $ 115 |
PPL Electric Utilities Corp [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  |
Capacity | $ 650 |
Commercial paper issuances | 0 | $ 0
Unused capacity | $ 650 |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 2.94% | 1.83%
Capacity | $ 350 |
Commercial paper issuances | 279 | $ 199
Unused capacity | $ 71 |
LG And E And KU Energy LLC [Member] | KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 2.94% | 1.97%
Capacity | $ 350 |
Commercial paper issuances | 235 | $ 45
Unused capacity | $ 115 |
Louisville Gas And Electric Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 2.94% | 1.83%
Capacity | $ 350 |
Commercial paper issuances | 279 | $ 199
Unused capacity | $ 71 |
Kentucky Utilities Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 2.94% | 1.97%
Capacity | $ 350 |
Commercial paper issuances | 235 | $ 45
Unused capacity | $ 115 |

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