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Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Oct. 01, 2020 GBP (£) | Oct. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 01, 2020 GBP (£) | Sep. 01, 2020 USD ($) | Aug. 01, 2020 USD ($) | Jun. 01, 2020 USD ($) | Apr. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 23,249 |  |  |  |  |  |  |  |  | $ 22,002
Unamortized premium and (discount), net |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 5
Unamortized debt issuance costs |  |  |  |  |  | (132) |  |  |  |  |  |  |  |  | (126)
Total Long-term Debt |  |  |  |  |  | 23,127 |  |  |  |  |  |  |  |  | 21,893
Less current portion of Long-term debt |  |  |  |  |  | 1,574 |  |  |  |  |  |  |  |  | 1,172
Long-term Debt |  |  |  |  |  | 21,553 |  |  |  |  |  |  |  |  | 20,721
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 1,574 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 1,374 |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 2,552 |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 950 |  |  |  |  |  |  |  |  |
2025 |  |  |  |  |  | 883 |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | 15,916 |  |  |  |  |  |  |  |  |
WPD [Member] | Senior Notes [Member] | Senior Notes Due 2021 [Member] | Intent to Redeem [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.375% |  |  |  |  |  |  |  |
WPD South West [Member] | Index-linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be redeemed in total by series |  |  |  |  |  | 441 |  | £ 331 |  |  |  |  |  |  |
WPD South Wales [Member] | Senior Notes [Member] | Senior Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  | £ 150 |  |  |  |  |  |
Stated interest rate | 9.25% |  |  |  |  |  |  |  | 9.25% |  |  |  |  |  |
WPD South Wales [Member] | Senior Notes [Member] | Senior Notes Due 2035 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  | £ 250 |  |  |  |  |  |
Stated interest rate | 1.625% |  |  |  |  |  |  |  | 1.625% |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Secured Debt | $ 319 | £ 247 |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 200 |
Interest rate on outstanding borrowing |  |  |  |  |  |  |  |  |  |  |  |  | 173.00% | 1.96% |
PPL Capital Funding [Member] | Term Loan Credit Facility [Member] | Term Loan Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |
Interest rate on outstanding borrowing |  |  |  |  |  |  |  |  |  |  |  |  | 1.72% |  |
PPL Capital Funding [Member] | Senior Notes [Member] | Senior Notes Due 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.125% |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  |  | $ 993 |  |  |  |  |  |  |  |  |  |
PPL Electric [Member] | Pollution Control Revenue Refunding Bonds [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 0.40% |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |
PPL Electric [Member] | Pollution Control Revenue Refunding Bonds, 2008 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 10,800 |  |  |  |  |  |  |  |  | 10,100
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 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 249 |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  | $ 5,500 |  |  |  |  |  |  |  |  | 5,300
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 |  |  |  |  |  |  |  |  |
LKE [Member] | 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 |  |  |  |  |  | $ 848 |  |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  |  |  |  | 33 |  |  |  |  |  |  |  |  |
LKE [Member] | Senior Notes [Member] | Senior Notes Due 2020 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 475 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  | $ 6,700 |  |  |  |  |  |  |  |  | 6,600
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 |  |  |  |  |  |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds Due 2050 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  |  | $ 493 |  |  |  |  |  |  |  |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds due 2020 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |
WPD South West, WPD East Midlands and WPD South Wales [Member] | Index-linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in principal due to inflation |  |  |  |  |  | $ 13 |  | £ 10 |  |  |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 23 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] | Pollution Control Revenue Bonds, 2016 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 125 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 1.30% |  |  |  |  |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 14,835 |  |  |  |  |  |  |  |  | 13,960
U.S. [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.95% |  | 3.95% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 4,850 |  |  |  |  |  |  |  |  | 4,325
U.S. [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.81% |  | 3.81% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 8,955 |  |  |  |  |  |  |  |  | 8,705
U.S. [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Potential To Be Called Within One Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |
U.S. [Member] | Junior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 4.35% |  | 4.35% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 930 |  |  |  |  |  |  |  |  | 930
U.S. [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 0.85% |  | 0.85% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  | 0
U.S. [Member] | PPL Capital Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 1,950 |  |  |  |  |  |  |  |  |
U.S. [Member] | PPL Capital Funding [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | 8,414 |  |  |  |  |  |  |  |  | 8,042
Fair market value adjustments |  |  |  |  |  | $ 8 |  |  |  |  |  |  |  |  | 12
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | £ |  |  |  |  |  |  |  | £ 1,155 |  |  |  |  |  |  |
U.K. [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 4.69% |  | 4.69% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 7,197 |  |  |  |  |  |  |  |  | 6,874
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be redeemed in total but not in part |  |  |  |  |  | $ 300 |  | £ 225 |  |  |  |  |  |  |
U.K. [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 1.46% |  | 1.46% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 67 |  |  |  |  |  |  |  |  | 64
U.K. [Member] | Index-linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 1.42% |  | 1.42% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 1,150 |  |  |  |  |  |  |  |  | 1,104
U.K. [Member] | Long-term Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be put back to the issuer |  |  |  |  |  | 7,700 |  | £ 5,800 |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | 4,289 |  |  |  |  |  |  |  |  | 4,039
Unamortized discount |  |  |  |  |  | (23) |  |  |  |  |  |  |  |  | (24)
Unamortized debt issuance costs |  |  |  |  |  | (30) |  |  |  |  |  |  |  |  | (30)
Total Long-term Debt |  |  |  |  |  | 4,236 |  |  |  |  |  |  |  |  | 3,985
Less current portion of Long-term debt |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  | 0
Long-term Debt |  |  |  |  |  | 3,836 |  |  |  |  |  |  |  |  | 3,985
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 474 |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 340 |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2025 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | $ 3,075 |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Pollution Control Revenue Refunding Bonds [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 0.40% |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Pollution Control Revenue Refunding Bonds, 2008 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.79% |  | 3.79% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 4,289 |  |  |  |  |  |  |  |  | 4,039
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 |  |  |  |  |  | 10,800 |  |  |  |  |  |  |  |  | 10,100
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 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 249 |  |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 6,116 |  |  |  |  |  |  |  |  | 6,041
Debt Instrument, Unamortized Premium |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  | 5
Unamortized discount |  |  |  |  |  | (13) |  |  |  |  |  |  |  |  | (12)
Unamortized debt issuance costs |  |  |  |  |  | (34) |  |  |  |  |  |  |  |  | (32)
Total Long-term Debt |  |  |  |  |  | 6,074 |  |  |  |  |  |  |  |  | 6,002
Less current portion of Long-term debt |  |  |  |  |  | 674 |  |  |  |  |  |  |  |  | 975
Long-term Debt |  |  |  |  |  | 5,400 |  |  |  |  |  |  |  |  | 5,027
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 674 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2025 |  |  |  |  |  | 550 |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | $ 4,879 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 4.38% |  | 4.38% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  | 725
LG And E And KU Energy LLC [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Potential To Be Called Within One Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.82% |  | 3.82% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 4,666 |  |  |  |  |  |  |  |  | 4,666
LG And E And KU Energy LLC [Member] | 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 |  |  |  |  |  | 848 |  |  |  |  |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  |  |  |  | $ 33 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.89% |  | 3.89% |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  | 650
LG And E And KU Energy LLC [Member] | Senior Notes [Member] | Senior Notes Due 2020 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 475 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  | $ 5,500 |  |  |  |  |  |  |  |  | 5,300
LG And E And KU Energy LLC [Member] | 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 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  | $ 6,700 |  |  |  |  |  |  |  |  | 6,600
LG And E And KU Energy LLC [Member] | 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 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds Due 2050 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  |  | 493 |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds due 2020 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.25% | 3.25% |  |  |
LG And E And KU Energy LLC [Member] | LOUISVILLE GAS And ELECTRIC CO [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 23 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |
LG And E And KU Energy LLC [Member] | LOUISVILLE GAS And ELECTRIC CO [Member] | Pollution Control Revenue Bonds, 2016 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 125 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 1.30% |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 2,024 |  |  |  |  |  |  |  |  | 2,024
Unamortized discount |  |  |  |  |  | (4) |  |  |  |  |  |  |  |  | (4)
Unamortized debt issuance costs |  |  |  |  |  | (13) |  |  |  |  |  |  |  |  | (15)
Total Long-term Debt |  |  |  |  |  | 2,007 |  |  |  |  |  |  |  |  | 2,005
Less current portion of Long-term debt |  |  |  |  |  | 292 |  |  |  |  |  |  |  |  | 0
Long-term Debt |  |  |  |  |  | 1,715 |  |  |  |  |  |  |  |  | 2,005
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 292 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2025 |  |  |  |  |  | 300 |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | 1,432 |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 23 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 0.90% |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] | Pollution Control Revenue Bonds, 2016 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 125 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 1.30% |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Potential To Be Called Within One Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |
LOUISVILLE GAS And ELECTRIC CO [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.69% |  | 3.69% |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 5,500 |  |  |  |  |  |  |  |  | 5,300
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 |  |  |  |  |  | $ 539 |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | 2,642 |  |  |  |  |  |  |  |  | 2,642
Debt Instrument, Unamortized Premium |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  | 5
Unamortized discount |  |  |  |  |  | (9) |  |  |  |  |  |  |  |  | (8)
Unamortized debt issuance costs |  |  |  |  |  | (20) |  |  |  |  |  |  |  |  | (16)
Total Long-term Debt |  |  |  |  |  | 2,618 |  |  |  |  |  |  |  |  | 2,623
Less current portion of Long-term debt |  |  |  |  |  | 132 |  |  |  |  |  |  |  |  | 500
Long-term Debt |  |  |  |  |  | 2,486 |  |  |  |  |  |  |  |  | 2,123
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 132 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
2025 |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | 2,247 |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Potential To Be Called Within One Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  | 3.92% |  | 3.92% |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 6,700 |  |  |  |  |  |  |  |  | $ 6,600
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 |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds Due 2050 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  |  | $ 493 |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds due 2020 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 3.25% | 3.25% |  |  |

X
- Definition The aggregate carrying value of property subject to lien. + References No definition available. + Details
Name: | ppl_CarryingValueOfPropertySubjectToLien
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of tax-exempt revenue bonds with a term rate mode at the end of the period. + References No definition available. + Details
Name: | ppl_DebtInstrumentAmountAtTermRateMode
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of tax-exempt revenue bonds with a variable rate mode at the end of the period. + References No definition available. + Details
Name: | ppl_DebtInstrumentAmountAtVariableRateMode
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of increase (decrease) to the principal amount of the original debt instrument resulting from inflation during the period. + References No definition available. + Details
Name: | ppl_DebtInstrumentIncreaseDecreaseDueToInflation
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The principal amount that may be redeemed, in total by series, at a later date, at the greater of the adjusted principal value and a make-whole value determined by reference to the gross real yield on a nominated U.K. government bond. + References No definition available. + Details
Name: | ppl_DebtInstrumentPrincipalAmountRedeemedInTotalBySeries
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The principal amount that may be redeemed, in whole or in part, at par at a later date and are subject to mandatory redemption upon determination that the interest rate on the bonds would be included in the holders' gross income for federal tax purposes. + References No definition available. + Details
Name: | ppl_DebtInstrumentPrincipalAmountRedeemedWholeOrPartPriorToMaturity
Namespace Prefix: | ppl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
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