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Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended
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Jun. 29, 2017 | Jun. 23, 2017 | Apr. 19, 2017 | Aug. 31, 2016
LKE [Member] | Kentucky Public Service Commission [Member] | Depreciation Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Depreciation Rate Increase (Decrease), Amount | $ 15 |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Return on Equity Increase (Decrease), Percentage |  |  | 9.75% |
Public Utilities, Approved Return on Equity, Percentage | 9.70% |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 59 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 57 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 5.20% |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 8 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 7 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 2.10% |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Depreciation Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Depreciation Rate Increase (Decrease), Amount | $ 4 |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Return on Equity All Existing Approved Environmental Cost Recovery Plans And Projects Increase (Decrease), Percentage |  | 9.70% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery All Other Projects, Percentage |  | 10.00% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery CCRs, Percentage |  | 9.80% |  |
KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Return on Equity Increase (Decrease), Percentage |  |  | 9.75% |
Public Utilities, Approved Return on Equity, Percentage | 9.70% |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 55 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 52 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 3.20% |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Depreciation Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Depreciation Rate Increase (Decrease), Amount | $ 11 |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Return on Equity All Existing Approved Environmental Cost Recovery Plans And Projects Increase (Decrease), Percentage |  | 9.70% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery All Other Projects, Percentage |  | 10.00% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery CCRs, Percentage |  | 9.80% |  |
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Depreciation Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Depreciation Rate Increase (Decrease), Amount | $ 15 |  |  |
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] |  |  |  |
Public Utilities, Proposed Return on Equity Increase (Decrease), Percentage |  |  | 9.75% |
Public Utilities, Approved Return on Equity, Percentage | 9.70% |  |  |
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] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 59 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 57 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 5.20% |  |  |
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] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 8 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 7 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 2.10% |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Return on Equity All Existing Approved Environmental Cost Recovery Plans And Projects Increase (Decrease), Percentage |  | 9.70% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery All Other Projects, Percentage |  | 10.00% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery CCRs, Percentage |  | 9.80% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Return on Equity Increase (Decrease), Percentage |  |  | 9.75% |
Public Utilities, Approved Return on Equity, Percentage | 9.70% |  |  |
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] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 55 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 52 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 3.20% |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Return on Equity All Existing Approved Environmental Cost Recovery Plans And Projects Increase (Decrease), Percentage |  | 9.70% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery All Other Projects, Percentage |  | 10.00% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery CCRs, Percentage |  | 9.80% |  |
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] |  |  |  |
Public Utilities, Proposed Return on Equity Increase (Decrease), Percentage |  |  | 9.75% |
Public Utilities, Approved Return on Equity, Percentage | 9.70% |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 59 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 57 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 5.20% |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 8 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 7 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 2.10% |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Depreciation Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Depreciation Rate Increase (Decrease), Amount | $ 4 |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Return on Equity All Existing Approved Environmental Cost Recovery Plans And Projects Increase (Decrease), Percentage |  | 9.70% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery All Other Projects, Percentage |  | 10.00% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery CCRs, Percentage |  | 9.80% |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Return on Equity Increase (Decrease), Percentage |  |  | 9.75% |
Public Utilities, Approved Return on Equity, Percentage | 9.70% |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Proposed Rate Increase (Decrease), Amount |  |  | $ 55 |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 52 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 3.20% |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Depreciation Rates [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Depreciation Rate Increase (Decrease), Amount | $ 11 |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Public Utilities, Approved Return on Equity All Existing Approved Environmental Cost Recovery Plans And Projects Increase (Decrease), Percentage |  | 9.70% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery All Other Projects, Percentage |  | 10.00% |  |
Public Utilities, Prior Approved Return on Equity Approved Environmental Cost Recovery CCRs, Percentage |  | 9.80% |  |

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