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Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Apr. 19, 2017 | Nov. 23, 2016 | Aug. 31, 2016 | Mar. 31, 2017
Regulatory Matters - Pennsylvania Activities - Act 129 (Numeric) [Abstract] |  |  |  |
Maximum amount of costs that can be recovered under the Act 129 Phase III plan |  |  |  | $ 313
Period over which program costs can be recovered (in years) |  |  |  | 5 years
Minimum term of long term supply contract under Act 129 (in years) |  |  |  | 4 years
Maximum term of long term supply contract under Act 129 (in years) |  |  |  | 20 years
Maximum percentage of long-term contracts that can be included in the mix of PLR supply contracts under Act 129 |  |  |  | 25.00%
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Requested return on equity |  | 10.23% |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Return On Equity Percentage | 9.75% |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 94 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 8.50% |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 59 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 5.40% |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 14 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 4.20% |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 8 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 2.30% |  |  |
KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Requested return on equity |  | 10.23% |  |
KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Return On Equity Percentage | 9.75% |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 103 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 6.40% |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 55 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 3.40% |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |
Regulatory Matters - Pennsylvania Activities - Act 129 (Numeric) [Abstract] |  |  |  |
Maximum amount of costs that can be recovered under the Act 129 Phase III plan |  |  |  | $ 313
Period over which program costs can be recovered (in years) |  |  |  | 5 years
Minimum term of long term supply contract under Act 129 (in years) |  |  |  | 4 years
Maximum term of long term supply contract under Act 129 (in years) |  |  |  | 20 years
Maximum percentage of long-term contracts that can be included in the mix of PLR supply contracts under Act 129 |  |  |  | 25.00%
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Gas Franchise (Numeric) [Abstract] |  |  |  |
Franchise Agreement Term |  |  | 5 years |
Days of Notice to Modify Franchise Fee |  |  | 60 days |
Franchise Fee Cap |  |  | 3.00% |
Franchise Fee If Recovered From Customers |  |  | 0.00% |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Requested return on equity |  | 10.23% |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Return On Equity Percentage | 9.75% |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 94 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 8.50% |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 59 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 5.40% |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 14 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 4.20% |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 8 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 2.30% |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Requested return on equity |  | 10.23% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Return On Equity Percentage | 9.75% |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 103 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 6.40% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 5 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 3.40% |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Gas Franchise (Numeric) [Abstract] |  |  |  |
Franchise Agreement Term |  |  | 5 years |
Days of Notice to Modify Franchise Fee |  |  | 60 days |
Franchise Fee Cap |  |  | 3.00% |
Franchise Fee If Recovered From Customers |  |  | 0.00% |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Requested return on equity |  | 10.23% |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Return On Equity Percentage | 9.75% |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 94 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 8.50% |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 59 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 5.40% |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 14 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 4.20% |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 8 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 2.30% |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Requested return on equity |  | 10.23% |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Return On Equity Percentage | 9.75% |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amount of increase requested in base rates with anticipated rate case filing |  | $ 103 |  |
Percent of increase requested in base rates with anticipated rate case filing |  | 6.40% |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities Proposed Rate Increase Decrease Amount | $ 55 |  |  |
Public Utilities Proposed Rate Increase Decrease Percentage | 3.40% |  |  |

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