Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions			6 Months Ended
	May 21, 2020	Mar. 31, 2020	Jun. 30, 2020
PPL Electric [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	11.18%
Change in Net Income due to ROE Adjustment			$ 12
Proposed Return Of Equity From Complaint	8.00%
Amended Proposed Return On Equity From Complaint	8.50%
LKE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters [Line Items]
Public Utilities Expected Capital Costs To Comply		$ 405
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage		972.50%
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage		972.50%
PPL Electric Utilities Corp [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	11.18%
Change in Net Income due to ROE Adjustment			$ 12
Proposed Return Of Equity From Complaint	8.00%
Amended Proposed Return On Equity From Complaint	8.50%
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters [Line Items]
Public Utilities Expected Capital Costs To Comply		$ 405
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters [Line Items]
Public Utilities Expected Capital Costs To Comply		$ 153
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage		972.50%
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters [Line Items]
Public Utilities Expected Capital Costs To Comply		$ 252
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage		972.50%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters [Line Items]
Public Utilities Expected Capital Costs To Comply		$ 153
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage		972.50%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member]
Regulatory Matters [Line Items]
Public Utilities Expected Capital Costs To Comply		$ 252
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage		972.50%