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Utility Rate Regulation (Regulatory Matters) (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 | Mar. 01, 2019 | Sep. 28, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2019
LKE [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities, Estimated Total Revenue Increase | $ 187 |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities, Revenue Increase Due To Elimination Of TCJA Bill Credit |  |  |  | $ 40 |  |  |
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 4 |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 2 |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities, Revenue Increase Due To Elimination Of TCJA Bill Credit |  |  |  | 12 |  |  |
Public Utilities Proposed Rate Increase Decrease Amount |  | 20 |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 19 |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities, Estimated Total Revenue Increase | 73 |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities, Revenue Increase Due To Elimination Of TCJA Bill Credit |  |  |  | $ 58 |  |  |
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 58 |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 56 |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Public Utilities, Estimated Total Revenue Increase | $ 114 |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 5 years |
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission [Member] | Tax Cuts And Jobs Act [Member] | Noncurrent [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - TCJA Impact On LG&E And KU Rates [Abstract] |  |  |  |  |  |  |
Approved Amount Of Rate Reduction Due To TCJA |  |  |  |  |  | $ 41 |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Requested return on equity |  |  | 10.42% |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  |  | $ 35 |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  |  | 25 |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  |  | $ 112 |  |  |  |
TCJA customer refund [Member] | PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - TCJA Impact On LG&E And KU Rates [Abstract] |  |  |  |  |  |  |
Approved Amount Of Rate Reduction Due To TCJA |  |  |  |  | $ 43 |  | $ 16

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