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Financing Activities (Short-term Debt) (Details) - Commercial Paper [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term Debt [Line Items] |  |
Capacity | $ 2,350 |
Commercial paper issuances | 474 | $ 500
Unused capacity | $ 1,876 |
PPL Capital Funding [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.64% | 1.10%
Capacity | $ 1,000 |
Commercial paper issuances | 230 | $ 20
Unused capacity | $ 770 |
PPL Electric [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  | 1.05%
Capacity | $ 650 |
Commercial paper issuances | 0 | $ 295
Unused capacity | $ 650 |
LGE [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.83% | 0.94%
Capacity | $ 350 |
Commercial paper issuances | 199 | $ 169
Unused capacity | $ 151 |
KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.97% | 0.87%
Capacity | $ 350 |
Commercial paper issuances | 45 | $ 16
Unused capacity | $ 305 |
PPL Electric Utilities Corp [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate |  | 1.05%
Capacity | $ 650 |
Commercial paper issuances | 0 | $ 295
Unused capacity | $ 650 |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.83% | 0.94%
Capacity | $ 350 |
Commercial paper issuances | 199 | $ 169
Unused capacity | $ 151 |
LG And E And KU Energy LLC [Member] | KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.97% | 0.87%
Capacity | $ 350 |
Commercial paper issuances | 45 | $ 16
Unused capacity | $ 305 |
Louisville Gas And Electric Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.83% | 0.94%
Capacity | $ 350 |
Commercial paper issuances | 199 | $ 169
Unused capacity | $ 151 |
Kentucky Utilities Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted-average interest rate | 1.97% | 0.87%
Capacity | $ 350 |
Commercial paper issuances | 45 | $ 16
Unused capacity | $ 305 |

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