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Financing Activities (Long-term Debt and Equity Securities) (Details) shares in Thousands, £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) | Nov. 30, 2017 GBP (£) | Oct. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Mar. 31, 2016 | Feb. 28, 2015 USD ($) Integer | Mar. 31, 2017 USD ($) | Mar. 31, 2017 GBP (£) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Jan. 31, 2018 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | $ 20,282 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,282 | $ 18,399 |  |  |  |
Less current portion of Long-term debt | 348 |  |  |  |  |  |  |  |  |  |  |  |  |  | 348 | 518 |  |  |  |
Long-term Debt | 19,847 |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,847 | 17,808 |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 348 |  |  |  |  |  |  |  |  |  |  |  |  |  | 348 |  |  |  |  |
2019 | 430 |  |  |  |  |  |  |  |  |  |  |  |  |  | 430 |  |  |  |  |
2020 | 1,278 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,278 |  |  |  |  |
2021 | 1,150 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,150 |  |  |  |  |
2022 | 1,274 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,274 |  |  |  |  |
Thereafter | 15,802 |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,802 |  |  |  |  |
Equity Programs (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 453 | 144 | $ 203 |  |  |
WPD [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Senior Debt | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 7.25% |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.25% |  |  |  | 7.25% |
WPD South West [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  | Dec. 31, 2029 | Dec. 31, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  | $ 326 | £ 247 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 304 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 304 |  |  |  | £ 225 |
Earliest date the company may redeem the debt in total by series |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 01, 2026 |  |  |  |  |
Increase (decrease) in principal due to inflation | 37 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37 |  |  |  | 27 |
WPD South Wales [Member] | Index Linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 50 |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.01% |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2029 | Dec. 31, 2029 |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 53 |  |  |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 64 |  |  |  |  |  |  |  |
Increase (decrease) in principal due to inflation | 37 |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  | 27 |
WPD East Midlands [Member] | Index Linked Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in principal due to inflation | 37 |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  | £ 27 |
PPL Capital Funding [Member] | Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |  |  |
Proceeds from debt, including premium net of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 490 |  |  |  |  |  |
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 108 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  | Aug. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 116 |  |  |  |  |  |  |  |  | $ 116 |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.80% |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |
Maturity date (in years) |  |  |  |  | Dec. 31, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  | Sep. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 8,500 |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,500 | 7,600 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 224 |  |  |  |  |
Principal amount that may be redeemed in whole or in part | 90 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 475 |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.95% |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  |  |  |  |  |  | $ 466 |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700 |  |  |  |  |
Borrowed | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 0 |  |  |  |
LGE [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  | Oct. 31, 2019 |  |  |  |  |  |  |  |  |  |  | Oct. 31, 2019 |  |  |  |  |
Interest rate on outstanding borrowing | 2.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.06% |  |  |  | 2.06% |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | $ 200 |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Borrowed | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 0 |  |  |  |
LGE [Member] | Term Loan Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |
LGE [Member] | Senior Secured Notes [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 128 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  |  |  | Apr. 01, 2019 |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2017 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 01, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Senior Secured Notes [Member] | Louisville/Jefferson County Metro Government Environmental Facilities Revenue Bonds 2001 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien | 4,700 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,700 | 4,400 |  |  |  |
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 | 514 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 514 |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode | 375 |  |  |  |  |  |  |  |  |  |  |  |  |  | 375 |  |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 598 |  |  |  |  |  |  |  |  |  |  |  |  |  | 598 |  |  |  |  |
Borrowed | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of property subject to lien | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 | $ 5,800 |  |  |  |
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 |  |  |  |  |
At The Market Stock Offering Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Programs (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued during the period | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,373 | 710 | 1,477 |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 377 | $ 25 | $ 49 |  |  |
Maximum Percentage Paid To Selling Agents |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Number of distribution agreements | Integer |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Aggregate sales price of common stock based on two separate equity distribution agreements |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | $ 12,919 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,919 | 11,854 |  |  |  |
U.S. [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.78% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.78% |  |  |  | 3.78% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |  |
Principal outstanding | $ 4,575 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,575 | 4,075 |  |  |  |
U.S. [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 2.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.06% |  |  |  | 2.06% |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |
Principal outstanding | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 0 |  |  |  |
U.S. [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.96% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.96% |  |  |  | 3.96% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |  |
Principal outstanding | $ 7,314 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,314 | 6,849 |  |  |  |
U.S. [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 5.10% |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.10% |  |  |  | 5.10% |
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 | 930 |  |  |  |
U.S. [Member] | PPL Capital Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 |  |  |  |  |
Borrowed | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | 7,363 |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,363 | 6,545 |  |  |  |
Fair market value adjustments | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 | 22 |  |  |  |
Unamortized premium and (discount), net | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 20 |  |  |  |
Unamortized debt issuance costs | (122) |  |  |  |  |  |  |  |  |  |  |  |  |  | (122) | (115) |  |  |  |
Total Long-term Debt | 20,195 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,195 | 18,326 |  |  |  |
Less current portion of Long-term debt | 348 |  |  |  |  |  |  |  |  |  |  |  |  |  | 348 | 518 |  |  |  |
Long-term Debt | 19,847 |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,847 | 17,808 |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be put back to the issuer | $ 6,400 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,400 |  |  |  | £ 4,700 |
Capacity | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,155 |
Borrowed | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 448 | £ 339
U.K. [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 5.24% |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.24% |  |  |  | 5.24% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2040 |  |  |  |  |
Principal outstanding | $ 6,351 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,351 | 5,707 |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount that may be redeemed in total but not in part | $ 304 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 304 |  |  |  | £ 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 | 1.56% |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.56% |  |  |  | 1.56% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2026 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2056 |  |  |  |  |
Principal outstanding | $ 1,012 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,012 | 838 |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | 3,339 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,339 | 2,864 |  |  |  |
Unamortized discount | (16) |  |  |  |  |  |  |  |  |  |  |  |  |  | (16) | (12) |  |  |  |
Unamortized debt issuance costs | (25) |  |  |  |  |  |  |  |  |  |  |  |  |  | (25) | (21) |  |  |  |
Total Long-term Debt | 3,298 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,298 | 2,831 |  |  |  |
Less current portion of Long-term debt | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 224 |  |  |  |
Long-term Debt | 3,298 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,298 | 2,607 |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2019 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2020 | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
2021 | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |  |
2022 | 474 |  |  |  |  |  |  |  |  |  |  |  |  |  | 474 |  |  |  |  |
Thereafter | $ 2,365 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,365 |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 108 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  | Aug. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 116 |  |  |  |  |  |  |  |  | $ 116 |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.80% |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |
Maturity date (in years) |  |  |  |  | Dec. 31, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  | Sep. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 4.23% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.23% |  |  |  | 4.23% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |  |
Principal outstanding | $ 3,339 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,339 | 2,864 |  |  |  |
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 | 8,500 |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,500 | 7,600 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 224 |  |  |  |  |
Principal amount that may be redeemed in whole or in part | 90 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  | $ 475 |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.95% |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  |  |  | Dec. 31, 2047 |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  |  |  |  |  |  | $ 466 |  |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | 5,200 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200 | 5,110 |  |  |  |
Fair market value adjustments | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1) |  |  |  |
Unamortized discount | (14) |  |  |  |  |  |  |  |  |  |  |  |  |  | (14) | (15) |  |  |  |
Unamortized debt issuance costs | (27) |  |  |  |  |  |  |  |  |  |  |  |  |  | (27) | (29) |  |  |  |
Total Long-term Debt | 5,159 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,159 | 5,065 |  |  |  |
Less current portion of Long-term debt | 98 |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 | 194 |  |  |  |
Long-term Debt | 5,061 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,061 | 4,871 |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 98 |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 |  |  |  |  |
2019 | 430 |  |  |  |  |  |  |  |  |  |  |  |  |  | 430 |  |  |  |  |
2020 | 975 |  |  |  |  |  |  |  |  |  |  |  |  |  | 975 |  |  |  |  |
2021 | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |
2022 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Thereafter | $ 3,447 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,447 |  |  |  |  |
LG And E And KU Energy LLC [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.97% |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 | 725 |  |  |  |
LG And E And KU Energy LLC [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 2.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.06% |  |  |  | 2.06% |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |
Principal outstanding | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 0 |  |  |  |
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.73% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.73% |  |  |  | 3.73% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2045 |  |  |  |  |
Principal outstanding | $ 3,975 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,975 | 3,985 |  |  |  |
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 | 514 |  |  |  |  |  |  |  |  |  |  |  |  |  | 514 |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode | $ 375 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 375 |  |  |  |  |
LG And E And KU Energy LLC [Member] | Note Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  | 3.50% |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2026 |  |  |  |  |
Principal outstanding | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 | 400 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  | 700 |  |  |  |  |
Borrowed | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 0 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  | Oct. 31, 2019 |  |  |  |  |  |  |  |  |  |  | Oct. 31, 2019 |  |  |  |  |
Interest rate on outstanding borrowing | 2.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.06% |  |  |  | 2.06% |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | $ 200 |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Borrowed | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 0 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Term Loan Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 128 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  |  |  | Apr. 01, 2019 |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2017 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 01, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Louisville/Jefferson County Metro Government Environmental Facilities Revenue Bonds 2001 Series A [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 4,700 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,700 | 4,400 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 598 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 598 |  |  |  |  |
Borrowed | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
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 | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 | 5,800 |  |  |  |
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 |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | 1,724 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,724 | 1,634 |  |  |  |
Fair market value adjustments | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1) |  |  |  |
Unamortized discount | (4) |  |  |  |  |  |  |  |  |  |  |  |  |  | (4) | (4) |  |  |  |
Unamortized debt issuance costs | (11) |  |  |  |  |  |  |  |  |  |  |  |  |  | (11) | (12) |  |  |  |
Total Long-term Debt | 1,709 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,709 | 1,617 |  |  |  |
Less current portion of Long-term debt | 98 |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 | 194 |  |  |  |
Long-term Debt | 1,611 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,611 | 1,423 |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  | 700 |  |  |  |  |
Borrowed | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 0 |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 98 |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 |  |  |  |  |
2019 | 334 |  |  |  |  |  |  |  |  |  |  |  |  |  | 334 |  |  |  |  |
2020 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2022 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Thereafter | $ 1,292 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,292 |  |  |  |  |
Louisville Gas And Electric Co [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  | Oct. 31, 2019 |  |  |  |  |  |  |  |  |  |  | Oct. 31, 2019 |  |  |  |  |
Interest rate on outstanding borrowing | 2.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.06% |  |  |  | 2.06% |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | $ 200 |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Borrowed | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 0 |  |  |  |
Louisville Gas And Electric Co [Member] | Term Loan Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |
Louisville Gas And Electric Co [Member] | Term Loan Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 2.06% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.06% |  |  |  | 2.06% |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |
Principal outstanding | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 0 |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Pollution Control Revenue Bonds, 2003 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 128 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  |  |  | Apr. 01, 2019 |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2017 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 01, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  |  |  |  |  |  | Dec. 31, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments Future Repurchase Date |  |  |  |  |  |  | Jun. 03, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Louisville/Jefferson County Metro Government Environmental Facilities Revenue Bonds 2001 Series A [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date (in years) |  | Dec. 31, 2027 | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.48% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.48% |  |  |  | 3.48% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2045 |  |  |  |  |
Principal outstanding | $ 1,624 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,624 | 1,634 |  |  |  |
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 | 4,700 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,700 | 4,400 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 391 |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode | 147 |  |  |  |  |  |  |  |  |  |  |  |  |  | 147 |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | 2,351 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,351 | 2,351 |  |  |  |
Unamortized discount | (9) |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) | (9) |  |  |  |
Unamortized debt issuance costs | (14) |  |  |  |  |  |  |  |  |  |  |  |  |  | (14) | (15) |  |  |  |
Total Long-term Debt | 2,328 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,328 | 2,327 |  |  |  |
Less current portion of Long-term debt | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Long-term Debt | 2,328 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,328 | 2,327 |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity | 598 |  |  |  |  |  |  |  |  |  |  |  |  |  | 598 |  |  |  |  |
Borrowed | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2019 | 96 |  |  |  |  |  |  |  |  |  |  |  |  |  | 96 |  |  |  |  |
2020 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2022 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Thereafter | $ 1,755 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,755 |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Rate | 3.91% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.91% |  |  |  | 3.91% |
Maturity date of long-term debt range start |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |
Maturity date of long-term date range end |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2045 |  |  |  |  |
Principal outstanding | $ 2,351 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,351 | 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 | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 | $ 5,800 |  |  |  |
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 | 123 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 123 |  |  |  |  |
Aggregate amount of tax-exempt revenue bonds in a variable rate mode | $ 228 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 228 |  |  |  |  |

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