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Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 GBP (£) | Jun. 30, 2019 USD ($) | Apr. 30, 2019 USD ($) | Oct. 31, 2019 USD ($) | Sep. 30, 2019 GBP (£) | Sep. 17, 2019 | Jun. 30, 2019 GBP (£)
WPD East Midlands [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  | £ 250 |  |
Stated interest rate | 1.75% |  |  |  |  | 1.75% |  |
Proceeds from Issuance of Secured Debt | $ 301 | £ 245 |  |  |  |  |  |
WPD PLC [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  | £ 50
Stated interest rate |  |  | 2.189% |  |  |  |  | 2.189%
Proceeds from Issuance of Secured Debt |  |  | $ 63 |  |  |  |  |
Debt instrument term (in years) |  |  | 5 years |  |  |  |  |
PPL Electric [Member] | Senior Secured Bonds 5.15% Series Due 2020 [Member] | Intent to Redeem Bond [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 100 |  |  |
Stated interest rate |  |  |  |  | 5.15% |  |  |
PPL Electric [Member] | First Mortgage [Member] | First Mortgage Bond Due 2049 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 400 |  |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  |  | 3.00% |  |
Proceeds from Issuance of Secured Debt | $ 390 |  |  |  |  |  |  |
LGE [Member] | Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 128 |  |  |  |
Stated interest rate |  |  |  | 1.85% |  |  |  |
LGE [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 31 |  |  |  |  |
Stated interest rate |  |  | 1.65% |  |  |  |  | 1.65%
LGE [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 35 |  |  |  |  |
Stated interest rate |  |  | 1.65% |  |  |  |  | 1.65%
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.75% |
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Interest Rate Conversion [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 40 |  |  |  |  |
LGE [Member] | First Mortgage [Member] | First Mortgage Bond Due 2049 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 400 |  |  |  |
Stated interest rate |  |  |  | 4.25% |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 396 |  |  |  |
KU [Member] | Pollution Control Revenue Refunding Bonds, 2016 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 96 |  |  |  |  |  |  |
Stated interest rate | 1.55% |  |  |  |  | 1.55% |  |
KU [Member] | Environmental Facilities Revenue Refunding Bonds, 2006 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 54 |  |  |  |  |  |  |
Stated interest rate | 1.20% |  |  |  |  | 1.20% |  |
KU [Member] | Environmental Facilities Revenue Bonds, 2008 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 78 |  |  |  |  |  |  |
Stated interest rate | 1.20% |  |  |  |  | 1.20% |  |
KU [Member] | Solid Waste Disposal Facility Revenue Bonds, 2000 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 13 |  |  |  |  |  |  |
Stated interest rate | 1.30% |  |  |  |  | 1.30% |  |
KU [Member] | Environmental Facilities Revenue Bonds, 2004 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 50 |  |  |  |  |  |  |
Stated interest rate | 1.75% |  |  |  |  | 1.75% |  |
KU [Member] | First Mortgage [Member] | First Mortgage Bond Due 2045 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 300 |  |  |  |
Stated interest rate |  |  |  | 4.375% |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 303 |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Bonds 5.15% Series Due 2020 [Member] | Intent to Redeem Bond [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 100 |  |  |
Stated interest rate |  |  |  |  | 5.15% |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage [Member] | First Mortgage Bond Due 2049 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 400 |  |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  |  | 3.00% |  |
Proceeds from Issuance of Secured Debt | $ 390 |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 128 |  |  |  |
Stated interest rate |  |  |  | 1.85% |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 31 |  |  |  |  |
Stated interest rate |  |  | 1.65% |  |  |  |  | 1.65%
LG And E And KU Energy LLC [Member] | LGE [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 35 |  |  |  |  |
Stated interest rate |  |  | 1.65% |  |  |  |  | 1.65%
LG And E And KU Energy LLC [Member] | LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.75% |
LG And E And KU Energy LLC [Member] | LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Interest Rate Conversion [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 40 |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | First Mortgage [Member] | First Mortgage Bond Due 2049 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 400 |  |  |  |
Stated interest rate |  |  |  | 4.25% |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 396 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Pollution Control Revenue Refunding Bonds, 2016 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 96 |  |  |  |  |  |  |
Stated interest rate | 1.55% |  |  |  |  | 1.55% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Environmental Facilities Revenue Refunding Bonds, 2006 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 54 |  |  |  |  |  |  |
Stated interest rate | 1.20% |  |  |  |  | 1.20% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Environmental Facilities Revenue Bonds, 2008 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 78 |  |  |  |  |  |  |
Stated interest rate | 1.20% |  |  |  |  | 1.20% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Solid Waste Disposal Facility Revenue Bonds, 2000 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 13 |  |  |  |  |  |  |
Stated interest rate | 1.30% |  |  |  |  | 1.30% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Environmental Facilities Revenue Bonds, 2004 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 50 |  |  |  |  |  |  |
Stated interest rate | 1.75% |  |  |  |  | 1.75% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage [Member] | First Mortgage Bond Due 2045 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 300 |  |  |  |
Stated interest rate |  |  |  | 4.375% |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 303 |  |  |  |
Louisville Gas And Electric Co [Member] | Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 128 |  |  |  |
Stated interest rate |  |  |  | 1.85% |  |  |  |
Louisville Gas And Electric Co [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 31 |  |  |  |  |
Stated interest rate |  |  | 1.65% |  |  |  |  | 1.65%
Louisville Gas And Electric Co [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 35 |  |  |  |  |
Stated interest rate |  |  | 1.65% |  |  |  |  | 1.65%
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.75% |
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Interest Rate Conversion [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 40 |  |  |  |  |
Louisville Gas And Electric Co [Member] | First Mortgage [Member] | First Mortgage Bond Due 2049 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 400 |  |  |  |
Stated interest rate |  |  |  | 4.25% |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 396 |  |  |  |
Kentucky Utilities Co [Member] | Pollution Control Revenue Refunding Bonds, 2016 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 96 |  |  |  |  |  |  |
Stated interest rate | 1.55% |  |  |  |  | 1.55% |  |
Kentucky Utilities Co [Member] | Environmental Facilities Revenue Refunding Bonds, 2006 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 54 |  |  |  |  |  |  |
Stated interest rate | 1.20% |  |  |  |  | 1.20% |  |
Kentucky Utilities Co [Member] | Environmental Facilities Revenue Bonds, 2008 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 78 |  |  |  |  |  |  |
Stated interest rate | 1.20% |  |  |  |  | 1.20% |  |
Kentucky Utilities Co [Member] | Solid Waste Disposal Facility Revenue Bonds, 2000 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 13 |  |  |  |  |  |  |
Stated interest rate | 1.30% |  |  |  |  | 1.30% |  |
Kentucky Utilities Co [Member] | Environmental Facilities Revenue Bonds, 2004 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount | $ 50 |  |  |  |  |  |  |
Stated interest rate | 1.75% |  |  |  |  | 1.75% |  |
Kentucky Utilities Co [Member] | First Mortgage [Member] | First Mortgage Bond Due 2045 [Member] |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 300 |  |  |  |
Stated interest rate |  |  |  | 4.375% |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 303 |  |  |  |

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