Utility Rate Regulation - Regulatory Matters (Details) $ in Millions									1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 27, 2023 USD ($)	Mar. 29, 2023 USD ($)	Mar. 21, 2023 USD ($)	Feb. 03, 2023 USD ($)	Jan. 27, 2023 USD ($)	Dec. 15, 2022 MW	Oct. 16, 2018	Aug. 24, 2018	Nov. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) MW	Sep. 30, 2022 USD ($)	Sep. 30, 2015	Sep. 30, 2023 USD ($) MW	Sep. 30, 2022 USD ($)
March 2023 Kentucky Wind Storms
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved | $										$ 75			$ 75
PPL Electric [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amortization of Revenue Reserve for ROE Challenge | $													74
PPL Electric [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase | $										$ 391	$ 352		$ 1,000	$ 974
LGE [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power						621
CPCN Solar Photovoltaic Facility to be constructed, Power						120
CPCN Solar Photovoltaic Facility to be acquired, Power						120
CPCN 4-Hour Energy Storage Facility to be Constructed, Power						125
CPCN New and Adjusted Energy Efficiency Programs, Overall Power Need Reduction						100
Total Capacity of Power Purchase Agreements Not Subject to KPSC Approval, Power						637
New NGCC LG&E Planned Ownership Percentage													31.00%
New Solar Units LG&E Planned Ownership Percentage													37.00%
Mill Creek 1 Unit, Generation Capacity, Power										300			300
E. W. Brown 3 Unit, Generation Capacity, Power										412			412
Mill Creek 2 Unit, Generation Capacity, Power										297			297
Ghent 2 Unit, Generation Capacity, Power										486			486
LGE [Member] | March 2023 Kentucky Wind Storms
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved | $										$ 33			$ 33
LGE [Member] | Federal Energy Regulatory Commsion [Member] | Other Regulatory Assets [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Increase (Decrease) in Regulatory Liabilities | $										$ 3
KU [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power						621
CPCN Solar Photovoltaic Facility to be constructed, Power						120
CPCN Solar Photovoltaic Facility to be acquired, Power						120
CPCN 4-Hour Energy Storage Facility to be Constructed, Power						125
CPCN New and Adjusted Energy Efficiency Programs, Overall Power Need Reduction						100
Total Capacity of Power Purchase Agreements Not Subject to KPSC Approval, Power						637
New NGCC KU Planned Ownership Percentage													69.00%
New Solar units LG&E Planned Ownership Percentage													63.00%
Mill Creek 1 Unit, Generation Capacity, Power										300			300
E. W. Brown 3 Unit, Generation Capacity, Power										412			412
Mill Creek 2 Unit, Generation Capacity, Power										297			297
Ghent 2 Unit, Generation Capacity, Power										486			486
KU [Member] | March 2023 Kentucky Wind Storms
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved | $										$ 42			$ 42
KU [Member] | Federal Energy Regulatory Commsion [Member] | Other Regulatory Assets [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Increase (Decrease) in Regulatory Liabilities | $										9
Rhode Island Energy | Rhode Island Public Uitilty Commsion
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage								9.275%
Supplemental Capital Investment to spend on the FY 2024 Gas ISR Plan | $					$ 187
Supplemental Capital Investment Spend amount agreed to between RIE and RIPUC | $				$ 171
Supplemental Capital Investment to spend on the FY 2024 Electric ISR Plan | $					176
2nd Supplemental Capita Investment to spend on the FY 2024 Electrical ISR Plan | $			$ 166
RIPUC Approved FY 2024 Gas ISR Plan for capital investment spend | $		$ 163
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend | $		112
Estimated net present value costs of AMF program | $									$ 188
Benefit - cost ratio yield of the AMF program									3.9
NPV to be obtained through AMF program over 20 years | $									$ 729
AMF Program Project Life, Years									20 years
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]
Supplemental Capital Investment to spend on the FY 2024 Electric ISR Plan | $					14
2nd Supplemental Capita Investment to spend on the FY 2024 Electrical ISR Plan | $			14
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]
Supplemental Capital Investment to spend on the FY 2024 Electric ISR Plan | $					$ 3
2nd Supplemental Capita Investment to spend on the FY 2024 Electrical ISR Plan | $			$ 1
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend | $		$ 1
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%
PPL Electric Utilities Corp [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amortization of Revenue Reserve for ROE Challenge | $													$ 74
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase | $										$ 391	$ 352		$ 1,000	$ 974
Louisville Gas And Electric Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power						621
CPCN Solar Photovoltaic Facility to be constructed, Power						120
CPCN Solar Photovoltaic Facility to be acquired, Power						120
CPCN 4-Hour Energy Storage Facility to be Constructed, Power						125
CPCN New and Adjusted Energy Efficiency Programs, Overall Power Need Reduction						100
Total Capacity of Power Purchase Agreements Not Subject to KPSC Approval, Power						637
New NGCC LG&E Planned Ownership Percentage													31.00%
New Solar Units LG&E Planned Ownership Percentage													37.00%
Mill Creek 1 Unit, Generation Capacity, Power										300			300
E. W. Brown 3 Unit, Generation Capacity, Power										412			412
Mill Creek 2 Unit, Generation Capacity, Power										297			297
Ghent 2 Unit, Generation Capacity, Power										486			486
Louisville Gas And Electric Co [Member] | March 2023 Kentucky Wind Storms
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved | $										$ 33			$ 33
Louisville Gas And Electric Co [Member] | Federal Energy Regulatory Commsion [Member] | Other Regulatory Assets [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Increase (Decrease) in Regulatory Liabilities | $										$ 3
Kentucky Utilities Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Combustion Turbine Facilities Power						621
CPCN Solar Photovoltaic Facility to be constructed, Power						120
CPCN Solar Photovoltaic Facility to be acquired, Power						120
CPCN 4-Hour Energy Storage Facility to be Constructed, Power						125
CPCN New and Adjusted Energy Efficiency Programs, Overall Power Need Reduction						100
Total Capacity of Power Purchase Agreements Not Subject to KPSC Approval, Power						637
New NGCC KU Planned Ownership Percentage													69.00%
New Solar units LG&E Planned Ownership Percentage													63.00%
Mill Creek 1 Unit, Generation Capacity, Power										300			300
E. W. Brown 3 Unit, Generation Capacity, Power										412			412
Mill Creek 2 Unit, Generation Capacity, Power										297			297
Ghent 2 Unit, Generation Capacity, Power										486			486
Kentucky Utilities Co [Member] | March 2023 Kentucky Wind Storms
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved | $										$ 42			$ 42
Kentucky Utilities Co [Member] | Federal Energy Regulatory Commsion [Member] | Other Regulatory Assets [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Increase (Decrease) in Regulatory Liabilities | $										$ 9