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Financing Activities - Long-term Debt (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 31, 2021 | Jul. 01, 2021 | Jun. 24, 2021 | May 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ (395,000) | $ 0 |  |  |  |  |  |
PPL Electric [Member] | First Mortgage Bond [Member] | First Mortgage Bonds, Floating Rate Series due 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 650,000 |  |  |
Proceeds from Issuance of Debt |  | $ 647,000 |  |  |  |  |  |  |  |  |
PPL Electric [Member] | First Mortgage Bond [Member] | First Mortgage Bonds, 3% Series due 2021 | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 400,000 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.00% |  |  |  |
PPL Capital Funding [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  | 1,550,000 |  |  |  |  |  |  |
Borrowed |  |  |  | 0 |  |  |  |  |  |  | $ 400,000
PPL Capital Funding [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  | 0 |  |  |  |  |  |  |
Borrowed |  |  |  | $ 0 |  |  |  |  |  |  | $ 100,000
PPL Capital Funding [Member] | Term Loan Facility [Member] | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 100,000 |
PPL Capital Funding [Member] | Senior Notes due 2023 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.40% | 3.40% |  |  | 3.40% |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2024 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.95% | 3.95% |  |  | 3.95% |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2043 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.70% | 4.70% |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2044 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.00% | 5.00% |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2047 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.00% | 4.00% |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes Due 2030 [Member] | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.125% | 4.125% |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2026 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.10% | 3.10% |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Junior Subordinated Notes due 2073 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 450,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.90% |  |  |  |  |
Loss on extinguishment of debt | $ 15,000 |  |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes [Member] | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | 58,000 |  | $ 322,000 |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 1,072,000 | $ 1,962,000 |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Aggregate Purchase Price | $ 1,133,000 | $ 1,000,000 |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2022 (4.20%) | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.20% | 4.20% |  |  | 4.20% |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes due 2022 (3.50%) | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.50% | 3.50% |  |  | 3.50% |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes 2 | Repayment |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Aggregate Purchase Price |  | $ 2,293,000 |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  | 4.14% |  | 3.71% |  |  |  |  |
LKE [Member] | Senior Notes [Member] | Senior Notes Due 2021 | Bond Redemption [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 250,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.375% |  |  |  |  |
LGE [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
LGE [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 128,000 |
Stated interest rate |  |  |  |  |  |  |  |  |  | 2.00% |
LGE [Member] | Jefferson County Environmental Facilities Revenue Refunding Bonds, 2001 Series B | Conversion to Weekly Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 35,000 | $ 35,000 |  |  |  |  |  |  |  |
LGE [Member] | Jefferson County Environmental Facilities Revenue Refunding Bond, 2007 Series A | Conversion to Weekly Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 31,000 | 31,000 |  |  |  |  |  |  |  |
LGE [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 28,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.625% |  |  |  |  |  |  |
KU [Member] | Carroll County Environmental Facilities Revenue Refunding Bonds, 2006 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 54,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.125% |  |  |  |  |  |  |
KU [Member] | Carroll County Environmental Facilities Revenue Bonds, 2008 series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 78,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.00% |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage Bond [Member] | First Mortgage Bonds, Floating Rate Series due 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 650,000 |  |  |
Proceeds from Issuance of Debt |  | 647,000 |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage Bond [Member] | First Mortgage Bonds, 3% Series due 2021 | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 400,000 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.00% |  |  |  |
Louisville Gas And Electric Co [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
Louisville Gas And Electric Co [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 128,000 |
Stated interest rate |  |  |  |  |  |  |  |  |  | 2.00% |
Louisville Gas And Electric Co [Member] | Jefferson County Environmental Facilities Revenue Refunding Bonds, 2001 Series B | Conversion to Weekly Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 35,000 | 35,000 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Jefferson County Environmental Facilities Revenue Refunding Bond, 2007 Series A | Conversion to Weekly Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 31,000 | $ 31,000 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 28,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.625% |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Carroll County Environmental Facilities Revenue Refunding Bonds, 2006 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 54,000 |  |  |  |  |  |  |
KU [Member] | Carroll County Environmental Facilities Revenue Bonds, 2008 series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 78,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.00% |  |  |  |  |  |  |
KU [Member] | Remarketed [Member] | Carroll County Environmental Facilities Revenue Refunding Bonds, 2006 Series B |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.125% |  |  |  |  |  |  |

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