Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions				9 Months Ended
	Sep. 29, 2020	May 21, 2020	Mar. 31, 2020	Sep. 30, 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			9.725%
Public Utilities, Approved Return on Equity, Percentage	9.20%
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			9.725%
Public Utilities, Approved Return on Equity, Percentage	9.20%
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			9.725%
Public Utilities, Approved Return on Equity, Percentage	9.20%
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			9.725%
Public Utilities, Approved Return on Equity, Percentage	9.20%
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			9.725%
Public Utilities, Approved Return on Equity, Percentage	9.20%
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			9.725%
Public Utilities, Approved Return on Equity, Percentage	9.20%