Utility Rate Regulation - Regulatory Matters (Details) $ in Millions							1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 26, 2024 USD ($)	Nov. 06, 2023 MW	Sep. 27, 2023 USD ($)	Mar. 29, 2023 USD ($)	Oct. 16, 2018	Aug. 24, 2018	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2016	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Oct. 04, 2024 USD ($)	Jun. 24, 2024 USD ($)	Apr. 26, 2024	Apr. 25, 2024 USD ($)	Nov. 21, 2023 USD ($)
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets							$ 1,874	$ 1,894			$ 1,894
Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets							97	108			108
Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								28			28
Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								12			12
PPL Electric [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Billing Issues, Expenses Incurred								$ 0	$ 12		$ 17	$ 21
Distribution System Improvement Charge Cap								5.00%			5.00%
PPL Electric [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase								$ 404	391		$ 1,000	1,000
PPL Electric [Member] | Pennsylvania Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
PPL Electric Billing Issue, Civil Penalty to be Paid																	$ 1
PPL Electric Billing Issue, Donation to be Paid																$ 1
Requested Distribution System Improvement Charge Cap															9.00%
PPL Electric Billing Issue donation paid per the settlement														$ 1
LGE [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power | MW		640
LGE [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								16			16
LGE [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								4			4
LGE [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								2			2
LGE [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								1			1
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Mill Creek Unit 1 retirement
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved													$ 125
KU [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power | MW		640
KU [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								12			12
KU [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								4			4
KU [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								10			10
KU [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								5			$ 5
Rhode Island Energy | Federal Energy Regulatory Commsion [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
New ROE prosed by NETO and approved by FERC					10.41%
Initial minimum base ROE to be reset by the FERC										11.14%
Maximum Base ROE reset by FERC										11.74%
Minimum base ROE reset by FERC										10.57%
Rhode Island Energy | Federal Energy Regulatory Commsion [Member] | Maximum ROE authorized
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
FERC Granted ROE											11.74%
Rhode Island Energy | Rhode Island Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage						9.275%
RIPUC Approved FY 2024 Gas ISR Plan for capital investment spend				$ 163
Recovery Cap on Capital Investment Related to AMF Program			$ 153
Capital Investment Spend on FY 2025 Gas ISR Plan							185
Proposed Capital Investment Spend on FY 2025 Electric ISR Plan							141
Proposed Contingency Plan Spend on FY 2025 Gas ISR Plan							11
Approved Capital Investment Spend on FY 2025 Gas ISR Plan	$ 180
Approved Contingency Plan Spend on FY 2025 Gas ISR Plan	11
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Approved Capital Investment Spend on FY 2025 Gas ISR Plan	168
Rhode Island Energy | Rhode Island Public Utility Commission | Paving Costs
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Approved Capital Investment Spend on FY 2025 Gas ISR Plan	12
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Proposed Capital Investment Spend on FY 2025 Electric ISR Plan							13
Approved Capital Investment Spend on FY 2025 Electric ISR Plan	13
Rhode Island Energy | Rhode Island Public Utility Commission | Other O&M
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Proposed Capital Investment Spend on FY 2025 Electric ISR Plan							1
Approved Capital Investment Spend on FY 2025 Electric ISR Plan	1
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Approved Capital Investment Spend on FY 2025 Electric ISR Plan	$ 132
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend				14
Rhode Island Energy | Rhode Island Public Utility Commission | Other O&M
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend				1
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend				$ 112
Rhode Island Energy | Rhode Island Public Utility Commission | Common equity percentage related to approved rate
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Percentage of common equity used on allowed ROE						51.00%
PPL Electric Utilities Corp [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Billing Issues, Expenses Incurred								$ 0	12		$ 17	21
Distribution System Improvement Charge Cap								5.00%			5.00%
Regulatory assets							598	$ 622			$ 622
PPL Electric Utilities Corp [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets							0	17			17
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase								404	$ 391		1,000	$ 1,000
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
PPL Electric Billing Issue, Civil Penalty to be Paid																	$ 1
PPL Electric Billing Issue, Donation to be Paid																$ 1
Requested Distribution System Improvement Charge Cap															9.00%
PPL Electric Billing Issue donation paid per the settlement														$ 1
Louisville Gas And Electric Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power | MW		640
New NGCC LG&E Planned Ownership Percentage		31.00%
Regulatory assets							395	389			389
Louisville Gas And Electric Co [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets							15	19			19
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								16			16
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								4			4
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								2			2
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								1			1
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Mill Creek Unit 1 retirement
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved													$ 125
Kentucky Utilities Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power | MW		640
New NGCC KU Planned Ownership Percentage		69.00%
Regulatory assets							439	438			438
Kentucky Utilities Co [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets							$ 14	23			23
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								12			12
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								4			4
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved								10			10
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | September 2024 KY Storm [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets								$ 5			$ 5