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Commitments and Contingencies (Energy Purchases, Energy Sales, Other Commitments and Legal Matters) (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2018 USD ($) | Oct. 29, 2018 USD ($) | Dec. 31, 2018 USD ($) resident claim mi | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 coal-fired_unit
Claim By Former Affiliate [Abstract] |  |  |  |  |  |
Restructuring And Related Activities Ownership Percentage By Riverstone |  | 35.00% |  |  |  |
Amount Of Alleged Improper Distribution |  | $ 733 |  |  |  |
Amount of special cash dividend | $ 500 |  |  |  |  |
LKE [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Expiration date of the power purchase agreement with OVEC |  |  | Jun. 30, 2040 |  |  |
LKE [Member] | Power Purchase [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
2019 |  |  | $ 27 |  |  |
2020 |  |  | 26 |  |  |
2021 |  |  | 27 |  |  |
2022 |  |  | 27 |  |  |
2023 |  |  | 27 |  |  |
Thereafter |  |  | 430 |  |  |
Total future obligation |  |  | 564 |  |  |
Purchases |  |  | $ 20 | $ 20 | $ 23 |
LGE [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of residents that filed class action suit | resident |  |  | 6 |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 4 |  |  |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  |  | 1 |  |  |
Generating units retired at the Cane Run plant | coal-fired_unit |  |  |  |  |  | 3
LGE [Member] | Minimum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 1 |  |  |
LGE [Member] | Maximum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 3 |  |  |
LGE and KU [Member] | Natural Gas Fuel Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
LGE and KU [Member] | Natural Gas Retail Supply Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
LGE and KU [Member] | Coal [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2023 |  |  |
LGE and KU [Member] | Coal Transportation And Fleeting Services [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2027 |  |  |
LGE and KU [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2026 |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Expiration date of the power purchase agreement with OVEC |  |  | Jun. 30, 2040 |  |  |
LG And E And KU Energy LLC [Member] | Power Purchase [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
2019 |  |  | $ 27 |  |  |
2020 |  |  | 26 |  |  |
2021 |  |  | 27 |  |  |
2022 |  |  | 27 |  |  |
2023 |  |  | 27 |  |  |
Thereafter |  |  | 430 |  |  |
Total future obligation |  |  | 564 |  |  |
Purchases |  |  | $ 20 | 20 | 23 |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of residents that filed class action suit | resident |  |  | 6 |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 4 |  |  |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  |  | 1 |  |  |
Generating units retired at the Cane Run plant | coal-fired_unit |  |  |  |  |  | 3
LG And E And KU Energy LLC [Member] | LGE [Member] | Minimum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 1 |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Maximum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 3 |  |  |
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Natural Gas Fuel Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Natural Gas Retail Supply Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Coal [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2023 |  |  |
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Coal Transportation And Fleeting Services [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2027 |  |  |
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2026 |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Expiration date of the power purchase agreement with OVEC |  |  | Jun. 30, 2040 |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of residents that filed class action suit | resident |  |  | 6 |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 4 |  |  |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  |  | 1 |  |  |
Generating units retired at the Cane Run plant | coal-fired_unit |  |  |  |  |  | 3
Louisville Gas And Electric Co [Member] | Minimum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 1 |  |  |
Louisville Gas And Electric Co [Member] | Maximum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | mi |  |  | 3 |  |  |
Louisville Gas And Electric Co [Member] | Power Purchase [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
2019 |  |  | $ 19 |  |  |
2020 |  |  | 18 |  |  |
2021 |  |  | 19 |  |  |
2022 |  |  | 19 |  |  |
2023 |  |  | 19 |  |  |
Thereafter |  |  | 297 |  |  |
Total future obligation |  |  | 391 |  |  |
Purchases |  |  | $ 14 | 14 | 16 |
Louisville Gas And Electric Co [Member] | Natural Gas Fuel Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
Louisville Gas And Electric Co [Member] | Natural Gas Retail Supply Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
Louisville Gas And Electric Co [Member] | Coal [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2023 |  |  |
Louisville Gas And Electric Co [Member] | Coal Transportation And Fleeting Services [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2027 |  |  |
Louisville Gas And Electric Co [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2026 |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Expiration date of the power purchase agreement with OVEC |  |  | Jun. 30, 2040 |  |  |
Kentucky Utilities Co [Member] | Power Purchase [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
2019 |  |  | $ 8 |  |  |
2020 |  |  | 8 |  |  |
2021 |  |  | 8 |  |  |
2022 |  |  | 8 |  |  |
2023 |  |  | 8 |  |  |
Thereafter |  |  | 133 |  |  |
Total future obligation |  |  | 173 |  |  |
Purchases |  |  | $ 6 | $ 6 | $ 7 |
Kentucky Utilities Co [Member] | Natural Gas Fuel Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
Kentucky Utilities Co [Member] | Natural Gas Retail Supply Purchase Contracts [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2020 |  |  |
Kentucky Utilities Co [Member] | Coal [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2023 |  |  |
Kentucky Utilities Co [Member] | Coal Transportation And Fleeting Services [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2027 |  |  |
Kentucky Utilities Co [Member] | Natural Gas Transportation [Member] |  |  |  |  |  |
Energy Purchase Commitments (Numeric) [Abstract] |  |  |  |  |  |
Maximum maturity date |  |  | 2026 |  |  |

X
- Definition The amount of the alleged improper distribution of the proceeds from the November 2014 sale of Talen Montana's (then PPL Montana's) hydroelectric generating facilities to PPL's subsidiaries. + References No definition available. + Details
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