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SCHEDULE I - NOTES TO CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Condensed Unconsolidated Financial Statements [Line Items] |  |
2020 | $ 1,278 |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
2021 | 1,150 |
Principal outstanding | 20,282 | $ 18,399
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
Maximum exposure | $ 201 |
Term of guarantee (in years) | 12 years |
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues | $ 200 |
Maximum exposure of other guarantees expiring related to a terminated lease | $ 100 |
L G And E And K U Energy L L C Unconsolidated [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
Loss Contingency, Settlement Agreement, Terms | 11 |
PPL Corp [Member] | PPL Guarantee [Member] | Financial Guarantee [Member] | Indemnifications issued by PPL Capital Funding [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
Maximum exposure | $ 9,700 |
Expiration date | 2073 |
L G And E And K U Energy L L C Unconsolidated [Member] | Senior Unsecured Notes [Member] |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |
2020 | $ 475 |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
2021 | 250 |
L G And E And K U Energy L L C Unconsolidated [Member] | Note Payable [Member] | PPL [Member] |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
Principal outstanding | $ 400 |
Maturity date (in years) | Dec. 31, 2026 |
L G And E And K U Energy L L C Unconsolidated [Member] | Note Payable [Member] | L G And E And K U Services Company [Member] |  |
Aggregate maturities of long-term debt (Details) [Abstract] |  |
Principal outstanding | $ 76 |
Maturity date (in years) | Dec. 31, 2019 |
Stated interest rate | 2.10% |
L G And E And K U Energy L L C 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 |
Maximum exposure of other guarantees expiring related to a terminated lease | $ 100 |
Expiration date maximum | 2023 |

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