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Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) | Oct. 31, 2018 GBP (£) | Jun. 30, 2018 USD ($) | May 31, 2018 USD ($) | May 31, 2018 GBP (£) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | May 31, 2018 GBP (£) | Mar. 31, 2018 GBP (£) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 20,694 |  |  |  | $ 20,282
Less current portion of Long-term debt |  |  |  |  |  |  |  |  | 530 |  |  |  | 348
Long-term Debt |  |  |  |  |  |  |  |  | 20,069 |  |  |  | 19,847
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  | 530 |  |  |  |
2020 |  |  |  |  |  |  |  |  | 1,266 |  |  |  |
2021 |  |  |  |  |  |  |  |  | 1,248 |  |  |  |
2022 |  |  |  |  |  |  |  |  | 1,274 |  |  |  |
2023 |  |  |  |  |  |  |  |  | 2,233 |  |  |  |
Thereafter |  |  |  |  |  |  |  |  | 14,143 |  |  |  |
WPD PLC [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  | £ 350 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.50% |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) | Dec. 31, 2026 | Dec. 31, 2026 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | £ |  | £ 346 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs | $ 456 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 407 | £ 319 |  |  |
Earliest date the company may redeem the debt in total by series |  |  |  |  |  |  |  |  | Dec. 01, 2026 |  |  |  |
WPD South Wales [Member] | Index-linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  |  |  | £ 30 |
Stated interest rate |  |  |  |  |  | 0.01% | 0.01% |  |  |  |  | 0.01% |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2036 | Dec. 31, 2036 |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | £ |  |  |  |  |  |  |  | £ 31 |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  |  |  |  |  |  | $ 44 |  |  |  |  |  |
WPD West Midlands [Member] | Index-linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  |  | £ 30 |  |
Stated interest rate |  |  |  | 0.01% |  |  |  |  |  |  | 0.01% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2028 | Dec. 31, 2028 |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | £ |  |  |  |  | £ 31 |  |  |  |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  |  |  | $ 41 |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 250 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.90% |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 9,400 |  |  |  | 8,500
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 |  |  |  |
Earliest date the company may redeem the debt in whole or in part |  |  |  |  |  |  |  |  | Oct. 31, 2020 |  |  |  |
Minimum length of time to convert interest rate mode |  |  |  |  |  |  |  |  | 1 year |  |  |  |
PPL Electric [Member] | First Mortgage Bonds [Member] | Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.15% |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  | Dec. 31, 2048 |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  | $ 394 |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 28 | $ 28 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.30% | 2.30% |  |  |  |  | 2.30% |
Maturity date (in years) |  |  |  |  |  | Dec. 31, 2026 |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  | Sep. 01, 2021 |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.55% |  |  |  |  |  |  | 2.55% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  | May 03, 2021 | May 03, 2021 |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.55% |  |  |  |  |  |  | 2.55% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  | May 03, 2021 | May 03, 2021 |  |  |  |  |  |  |  |
LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  |  |  |  | $ 5,100 |  |  |  | 4,700
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 |  |  |  |  |  |  |  |  | $ 505 |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  |  |  |  |  |  |  | 375 |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  |  |  |  | $ 6,300 |  |  |  | 6,000
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 |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 33 | £ 26 |  |  |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 13,160 |  |  |  | 12,919
U.S. [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.88% | 3.88% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 4,325 |  |  |  | 4,575
U.S. [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.99% | 3.99% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2048 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 7,705 |  |  |  | 7,314
U.S. [Member] | Junior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 5.68% | 5.68% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2067 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2073 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 930 |  |  |  | 930
U.S. [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 2.97% | 2.97% |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 200 |  |  |  | 100
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | 7,534 |  |  |  | 7,363
Fair market value adjustments |  |  |  |  |  |  |  |  | 16 |  |  |  | 21
Unamortized premium and (discount), net |  |  |  |  |  |  |  |  | 9 |  |  |  | 14
Unamortized debt issuance costs |  |  |  |  |  |  |  |  | (120) |  |  |  | (122)
Total Long-term Debt |  |  |  |  |  |  |  |  | 20,599 |  |  |  | 20,195
Less current portion of Long-term debt |  |  |  |  |  |  |  |  | 530 |  |  |  | 348
Long-term Debt |  |  |  |  |  |  |  |  | 20,069 |  |  |  | 19,847
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be put back to the issuer |  |  |  |  |  |  |  |  | $ 6,700 | £ 5,300 |  |  |
U.K. [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 5.13% | 5.13% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2040 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 6,471 |  |  |  | 6,351
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be redeemed in total but not in part |  |  |  |  |  |  |  |  | $ 287 | £ 225 |  |  |
Earliest date the company may redeem the debt in total but not in part |  |  |  |  |  |  |  |  | Dec. 21, 2026 |  |  |  |
U.K. [Member] | Index-linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 1.45% | 1.45% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2026 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2056 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 1,063 |  |  |  | 1,012
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | 3,739 |  |  |  | 3,339
Unamortized discount |  |  |  |  |  |  |  |  | (18) |  |  |  | (16)
Unamortized debt issuance costs |  |  |  |  |  |  |  |  | (27) |  |  |  | (25)
Total Long-term Debt |  |  |  |  |  |  |  |  | 3,694 |  |  |  | 3,298
Less current portion of Long-term debt |  |  |  |  |  |  |  |  | 0 |  |  |  | 0
Long-term Debt |  |  |  |  |  |  |  |  | 3,694 |  |  |  | 3,298
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  | 0 |  |  |  |
2020 |  |  |  |  |  |  |  |  | 100 |  |  |  |
2021 |  |  |  |  |  |  |  |  | 400 |  |  |  |
2022 |  |  |  |  |  |  |  |  | 474 |  |  |  |
2023 |  |  |  |  |  |  |  |  | 90 |  |  |  |
Thereafter |  |  |  |  |  |  |  |  | $ 2,675 |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 4.22% | 4.22% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2048 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 3,739 |  |  |  | 3,339
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 |  |  |  |  |  |  |  |  | 9,400 |  |  |  | 8,500
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 |  |  |  |
Earliest date the company may redeem the debt in whole or in part |  |  |  |  |  |  |  |  | Oct. 31, 2020 |  |  |  |
Minimum length of time to convert interest rate mode |  |  |  |  |  |  |  |  | 1 year |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.15% |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  | Dec. 31, 2048 |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  | $ 394 |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 5,541 |  |  |  | 5,200
Unamortized discount |  |  |  |  |  |  |  |  | (13) |  |  |  | (14)
Unamortized debt issuance costs |  |  |  |  |  |  |  |  | (26) |  |  |  | (27)
Total Long-term Debt |  |  |  |  |  |  |  |  | 5,502 |  |  |  | 5,159
Less current portion of Long-term debt |  |  |  |  |  |  |  |  | 530 |  |  |  | 98
Long-term Debt |  |  |  |  |  |  |  |  | 4,972 |  |  |  | 5,061
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  | 530 |  |  |  |
2020 |  |  |  |  |  |  |  |  | 975 |  |  |  |
2021 |  |  |  |  |  |  |  |  | 348 |  |  |  |
2022 |  |  |  |  |  |  |  |  | 0 |  |  |  |
2023 |  |  |  |  |  |  |  |  | 13 |  |  |  |
Thereafter |  |  |  |  |  |  |  |  | $ 3,675 |  |  |  |
LG And E And KU Energy LLC [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.97% | 3.97% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 725 |  |  |  | 725
LG And E And KU Energy LLC [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 2.97% | 2.97% |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 200 |  |  |  | 100
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.76% | 3.76% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2045 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 3,966 |  |  |  | 3,975
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 |  |  |  |  |  |  |  |  | 505 |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  |  |  |  |  |  |  | $ 375 |  |  |  |
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.69% | 3.69% |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 650 |  |  |  | 400
LG And E And KU Energy LLC [Member] | Note Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2026 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2028 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 28 | $ 28 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.30% | 2.30% |  |  |  |  | 2.30% |
Maturity date (in years) |  |  |  |  |  | Dec. 31, 2026 |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  | Sep. 01, 2021 |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.55% |  |  |  |  |  |  | 2.55% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  | May 03, 2021 | May 03, 2021 |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.55% |  |  |  |  |  |  | 2.55% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  | May 03, 2021 | May 03, 2021 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 5,100 |  |  |  | 4,700
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] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien |  |  |  |  |  |  |  |  | $ 6,300 |  |  |  | 6,000
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] | Affiliated Entity [Member] | Note Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Noncurrent |  |  |  | $ 250 |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.00% |  |  |  |  |  |  | 4.00% |  |
Maturity date (in years) |  |  |  | May 31, 2028 | May 31, 2028 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 1,824 |  |  |  | 1,724
Unamortized discount |  |  |  |  |  |  |  |  | (4) |  |  |  | (4)
Unamortized debt issuance costs |  |  |  |  |  |  |  |  | (11) |  |  |  | (11)
Total Long-term Debt |  |  |  |  |  |  |  |  | 1,809 |  |  |  | 1,709
Less current portion of Long-term debt |  |  |  |  |  |  |  |  | 434 |  |  |  | 98
Long-term Debt |  |  |  |  |  |  |  |  | 1,375 |  |  |  | 1,611
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  | 434 |  |  |  |
2020 |  |  |  |  |  |  |  |  | 0 |  |  |  |
2021 |  |  |  |  |  |  |  |  | 98 |  |  |  |
2022 |  |  |  |  |  |  |  |  | 0 |  |  |  |
2023 |  |  |  |  |  |  |  |  | 0 |  |  |  |
Thereafter |  |  |  |  |  |  |  |  | $ 1,292 |  |  |  |
Louisville Gas And Electric Co [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 2.97% | 2.97% |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 200 |  |  |  | 100
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 28 | $ 28 |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.30% | 2.30% |  |  |  |  | 2.30% |
Maturity date (in years) |  |  |  |  |  | Dec. 31, 2026 |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  | Sep. 01, 2021 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.55% |  |  |  |  |  |  | 2.55% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  | May 03, 2021 | May 03, 2021 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 35 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.55% |  |  |  |  |  |  | 2.55% |  |
Maturity date (in years) |  |  |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  | May 03, 2021 | May 03, 2021 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.58% | 3.58% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2045 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 1,624 |  |  |  | 1,624
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 |  |  |  |  |  |  |  |  | $ 5,100 |  |  |  | 4,700
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 |  |  |  |  |  |  |  |  | $ 391 |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  |  |  |  |  |  |  | 147 |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | 2,342 |  |  |  | 2,351
Unamortized discount |  |  |  |  |  |  |  |  | (8) |  |  |  | (9)
Unamortized debt issuance costs |  |  |  |  |  |  |  |  | (13) |  |  |  | (14)
Total Long-term Debt |  |  |  |  |  |  |  |  | 2,321 |  |  |  | 2,328
Less current portion of Long-term debt |  |  |  |  |  |  |  |  | 96 |  |  |  | 0
Long-term Debt |  |  |  |  |  |  |  |  | 2,225 |  |  |  | 2,328
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  | 96 |  |  |  |
2020 |  |  |  |  |  |  |  |  | 500 |  |  |  |
2021 |  |  |  |  |  |  |  |  | 0 |  |  |  |
2022 |  |  |  |  |  |  |  |  | 0 |  |  |  |
2023 |  |  |  |  |  |  |  |  | 13 |  |  |  |
Thereafter |  |  |  |  |  |  |  |  | $ 1,733 |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate |  |  |  |  |  |  |  |  | 3.89% | 3.89% |  |  |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  | Dec. 31, 2045 |  |  |  |
Principal outstanding |  |  |  |  |  |  |  |  | $ 2,342 |  |  |  | 2,351
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 |  |  |  |  |  |  |  |  | $ 6,300 |  |  |  | $ 6,000
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 |  |  |  |  |  |  |  |  | $ 114 |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode |  |  |  |  |  |  |  |  | $ 228 |  |  |  |

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- 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
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