Utility Rate Regulation - Regulatory Matters (Details) $ in Millions							1 Months Ended	3 Months Ended
	Mar. 26, 2024 USD ($)	Nov. 06, 2023 MW	Sep. 27, 2023 USD ($)	Mar. 29, 2023 USD ($)	Oct. 16, 2018	Aug. 24, 2018	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2016	Apr. 26, 2024	Apr. 25, 2024 USD ($)	Nov. 21, 2023 USD ($)
PPL Electric [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Billing Issues, Expenses Incurred								$ 15	$ 3
Distribution System Improvement Charge Cap								5.00%
PPL Electric [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase								$ 419	358
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 [Member] | Pennsylvania Public Utility Commission | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
PPL Electric Billing Issue, Donation to be Paid												$ 1
Requested Distribution System Improvement Charge Cap											9.00%
LGE [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power | MW		640
KU [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power | MW		640
Rhode Island Energy | Rhode Island Public Uitilty Commsion
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
Rhode Island Energy | Rhode Island Public Uitilty Commsion | 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 Uitilty Commsion | 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 Uitilty Commsion | 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 Uitilty Commsion | Common equity percentage related to approved rate
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Percentage of common equity used on allowed ROE						51.00%
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]
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
PPL Electric Utilities Corp [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Billing Issues, Expenses Incurred								$ 15	3
Distribution System Improvement Charge Cap								5.00%
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase								$ 419	$ 358
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 Utilities Corp [Member] | Pennsylvania Public Utility Commission | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
PPL Electric Billing Issue, Donation to be Paid												$ 1
Requested Distribution System Improvement Charge Cap											9.00%
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%
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%