Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions				3 Months Ended	7 Months Ended	12 Months Ended	60 Months Ended
	Apr. 19, 2021	Nov. 25, 2020	May 21, 2020	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	May 31, 2026
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%
Regulatory Liability due to ROE Reserve, After Tax				19	$ 13
LKE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 331
Public Utilities, Requested Bill Credit		$ 53
LKE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 217
LGE [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
LGE [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
LGE [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
LGE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Bill Credit		$ 41
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 131
Public Utilities, Requested Rate Increase (Decrease), Percentage		11.60%
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 77
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.30%
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 24
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
KU [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
KU [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
KU [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 170
Public Utilities, Requested Rate Increase (Decrease), Percentage		10.40%
Public Utilities, Requested Bill Credit		$ 12
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 116
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
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%
Regulatory Liability due to ROE Reserve, After Tax				$ 19	$ 13
PPL Electric Utilities Corp [Member] | PPL Electric [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Act 129 Recovery Period Under Phase IV Plan							5 years
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		331
Public Utilities, Requested Bill Credit		$ 53
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 217
LG And E And KU Energy LLC [Member] | LGE [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
LG And E And KU Energy LLC [Member] | LGE [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
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, Approved Return on Equity, Percentage	9.55%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Bill Credit		$ 41
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 131
Public Utilities, Requested Rate Increase (Decrease), Percentage		11.60%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 77
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.30%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 24
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
LG And E And KU Energy LLC [Member] | KU [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
LG And E And KU Energy LLC [Member] | KU [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
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, Approved Return on Equity, Percentage	9.55%
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 170
Public Utilities, Requested Rate Increase (Decrease), Percentage		10.40%
Public Utilities, Requested Bill Credit		$ 12
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 116
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
Louisville Gas And Electric Co [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
Louisville Gas And Electric Co [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
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, Approved Return on Equity, Percentage	9.55%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Bill Credit		$ 41
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 131
Public Utilities, Requested Rate Increase (Decrease), Percentage		11.60%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 77
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.30%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 24
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
Kentucky Utilities Co [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
Kentucky Utilities Co [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 170
Public Utilities, Requested Rate Increase (Decrease), Percentage		10.40%
Public Utilities, Requested Bill Credit		$ 12
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 116