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SCHEDULE I - NOTES TO CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Condensed Unconsolidated Financial Statements [Line Items] |  |
2020 | $ 1,266 |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
2021 | 1,274 |
Principal outstanding | 20,694 | $ 20,282
Thereafter | 14,143 |
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
Maximum exposure | $ 200 |
Expiration date | 2021 |
Term of guarantee (in years) | 12 years |
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues | $ 200 |
LG&E and KU Energy LLC Unconsolidated [Member] | Senior Unsecured Notes [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
2020 | 475 |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
2021 | $ 250 |
Maturity date (in years) | Dec. 31, 2021 |
Maturity date (in years) | Dec. 31, 2020 |
LG&E and KU Energy LLC Unconsolidated [Member] | Note Payable [Member] |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
Maturity date (in years) | Dec. 31, 2028 |
LG&E and KU Energy LLC Unconsolidated [Member] | Note Payable [Member] | PPL [Member] |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
Principal outstanding | $ 650 |
LG&E and KU Energy LLC Unconsolidated [Member] | LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
Term of guarantee (in years) | 12 |
Expiration date minimum | 2021 |
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues | $ 200 |

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- Definition The maximum exposure of a guarantee related to the termination of a lease related to certain non-utility generating stations in western Kentucky until July 2009. This portion of the guarantee relates to covering operational, regulatory and environmental commitments and indemnifications made under the agreement. + References No definition available. + Details
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