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Financing Activities - Long-term Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Jul. 01, 2021 | Jun. 24, 2021 | May 31, 2021 | Apr. 30, 2021 | Apr. 01, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 11,251 | $ 14,835 |  |  |  |  |  |  |
Unamortized premium and (discount), net |  |  | (34) | (40) |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | (77) | (106) |  |  |  |  |  |  |
Total Long-term Debt |  |  | 11,140 | 14,689 |  |  |  |  |  |  |
Less current portion of Long-term debt |  |  | 474 | 1,074 |  |  |  |  |  |  |
Long-term Debt |  |  | 10,666 | 13,615 |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
2022 |  |  | 474 |  |  |  |  |  |  |  |
2023 |  |  | 353 |  |  |  |  |  |  |  |
2024 |  |  | 650 |  |  |  |  |  |  |  |
2025 |  |  | 550 |  |  |  |  |  |  |  |
2026 |  |  | 904 |  |  |  |  |  |  |  |
Thereafter |  |  | 8,320 |  |  |  |  |  |  |  |
Loss on Extinguishment of Debt |  |  | $ (395) | 0 | $ 0 |  |  |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  | 3.81% |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 1,566 | 4,850 |  |  |  |  |  |  |
Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  | 3.59% |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 9,205 | 8,955 |  |  |  |  |  |  |
Junior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  | 2.89% |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 480 | 930 |  |  |  |  |  |  |
Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 0 | 100 |  |  |  |  |  |  |
First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a term rate mode |  |  | 782 |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes Due 2021 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 250 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  | 1,350 |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  | 0 |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 100
PPL Capital Funding [Member] | Repayment | Senior Notes due 2022 (4.20%) |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.20% | 4.20% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2022 (3.50%) |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.50% | 3.50% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.40% | 3.40% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.95% | 3.95% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2043 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.70% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2044 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.00% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2047 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.00% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes Due 2030 [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.125% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.10% |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Aggregate Purchase Price | $ 1,133 | $ 1,000 |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 1,072 | 1,962 |  |  |  |  |  |  |  |  |
Loss on Extinguishment of Debt | (58) | (322) |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Senior Notes 2 |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Aggregate Purchase Price |  | $ 2,293 |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Repayment | Junior Subordinated Notes due 2073 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 450 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 5.90% |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss on Extinguishment of Debt | $ (15) |  |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes [Member] | Repayment |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.71% | 4.14% |  |  |  |  |  |  |  |  |
PPL Electric [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Potential To Be Called Within One Year [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 650 |  |  |  |  |  |  |  |
PPL Electric [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Currently Able To Be Called |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 250 |  |  |  |  |  |  |  |
PPL Electric [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  | 11,300 | 10,800 |  |  |  |  |  |  |
PPL Electric [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Pollution Control Revenue Refunding Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be redeemed at a future date |  |  | 224 |  |  |  |  |  |  |  |
Principal amount that may be redeemed in whole or in part |  |  | $ 90 |  |  |  |  |  |  |  |
Minimum length of time to convert interest rate mode |  |  | 1 year |  |  |  |  |  |  |  |
PPL Electric [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, Floating Rate Series due 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 650 |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 647 |  |  |  |  |  |  |  |  |
PPL Electric [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, 3% Series due 2021 | Redemption |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 400 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.00% |  |  |  |
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 128 |
LGE [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
LGE [Member] | Louisville/Jefferson County Metro Government Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Environmental Facilities Revenue Refunding Bonds, 2007 Series B | Conversion to Weekly Interest Rate |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 31 |  |  |  |  |  |  |  |  |
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Environmental Revenue Refunding Bonds, 2007 Series B | Conversion to Weekly Interest Rate |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 35 |  |  |  |  |  |  |  |  |
LGE [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series A | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 28 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 0.625% |  |  |  |  |
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 2.00% |
LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  | $ 5,700 | 5,500 |  |  |  |  |  |  |
LGE [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum length of time to convert interest rate mode |  |  | 1 year |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  | $ 66 |  |  |  |  |  |  |  |
LKE [Member] | Senior Notes [Member] | Senior Notes Due 2021 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 250 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |  |  |  |  |  |  |
KU [Member] | Carroll County of Kentucky Environmental Facilities Revenue Refunding Bonds, 2006 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 54 |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.125% |  |  |  |  |  |  |  |  |
KU [Member] | Carroll County of Kentucky Environmental Facilities Revenue Refunding Bonds, | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 78 |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.00% |  |  |  |  |  |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  | $ 6,900 | 6,700 |  |  |  |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum length of time to convert interest rate mode |  |  | 1 year |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  | $ 33 |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 4,539 | 4,289 |  |  |  |  |  |  |
Unamortized discount |  |  | (22) | (23) |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | (33) | (30) |  |  |  |  |  |  |
Total Long-term Debt |  |  | 4,484 | 4,236 |  |  |  |  |  |  |
Less current portion of Long-term debt |  |  | 474 | 400 |  |  |  |  |  |  |
Long-term Debt |  |  | 4,010 | 3,836 |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
2022 |  |  | 474 |  |  |  |  |  |  |  |
2023 |  |  | 340 |  |  |  |  |  |  |  |
2024 |  |  | 650 |  |  |  |  |  |  |  |
2025 |  |  | 0 |  |  |  |  |  |  |  |
2026 |  |  | 0 |  |  |  |  |  |  |  |
Thereafter |  |  | $ 3,075 |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  | 3.37% |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 4,539 | 4,289 |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Potential To Be Called Within One Year [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 650 |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Currently Able To Be Called |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 250 |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  | 11,300 | 10,800 |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Pollution Control Revenue Refunding Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be redeemed at a future date |  |  | 224 |  |  |  |  |  |  |  |
Principal amount that may be redeemed in whole or in part |  |  | $ 90 |  |  |  |  |  |  |  |
Minimum length of time to convert interest rate mode |  |  | 1 year |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, Floating Rate Series due 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 650 |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 647 |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, 3% Series due 2021 | Redemption |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 400 |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.00% |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 2,024 | 2,024 |  |  |  |  |  |  |
Unamortized discount |  |  | (4) | (4) |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | (14) | (13) |  |  |  |  |  |  |
Total Long-term Debt |  |  | 2,006 | 2,007 |  |  |  |  |  |  |
Less current portion of Long-term debt |  |  | 0 | 292 |  |  |  |  |  |  |
Long-term Debt |  |  | 2,006 | 1,715 |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
2022 |  |  | 0 |  |  |  |  |  |  |  |
2023 |  |  | 0 |  |  |  |  |  |  |  |
2024 |  |  | 0 |  |  |  |  |  |  |  |
2025 |  |  | 300 |  |  |  |  |  |  |  |
2026 |  |  | 90 |  |  |  |  |  |  |  |
Thereafter |  |  | $ 1,634 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 128 |
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 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 35 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.35% |  |
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Environmental Facilities Revenue Refunding Bonds, 2007 Series B | Conversion to Weekly Interest Rate |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 31 |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Environmental Revenue Refunding Bonds, 2007 Series B | Conversion to Weekly Interest Rate |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 35 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 0.625% |  |  |  |  |
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 2.00% |
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  | 3.59% |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 2,024 | 2,024 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  | $ 5,700 | 5,500 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum length of time to convert interest rate mode |  |  | 1 year |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a term rate mode |  |  | $ 473 |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  | 66 |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  | 2,642 | 2,642 |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  | 5 | 5 |  |  |  |  |  |  |
Unamortized discount |  |  | (9) | (9) |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | (20) | (20) |  |  |  |  |  |  |
Total Long-term Debt |  |  | 2,618 | 2,618 |  |  |  |  |  |  |
Less current portion of Long-term debt |  |  | 0 | 132 |  |  |  |  |  |  |
Long-term Debt |  |  | 2,618 | 2,486 |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
2022 |  |  | 0 |  |  |  |  |  |  |  |
2023 |  |  | 13 |  |  |  |  |  |  |  |
2024 |  |  | 0 |  |  |  |  |  |  |  |
2025 |  |  | 250 |  |  |  |  |  |  |  |
2026 |  |  | 164 |  |  |  |  |  |  |  |
Thereafter |  |  | $ 2,215 |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Carroll County of Kentucky Environmental Facilities Revenue Refunding Bonds, 2006 Series B | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 54 |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.125% |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Carroll County of Kentucky Environmental Facilities Revenue Refunding Bonds, | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 78 |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.00% |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  | 3.97% |  |  |  |  |  |  |  |
Principal outstanding |  |  | $ 2,642 | 2,642 |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  | $ 6,900 | $ 6,700 |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum length of time to convert interest rate mode |  |  | 1 year |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a term rate mode |  |  | $ 309 |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  | $ 33 |  |  |  |  |  |  |  |

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