Utility Rate Regulation - Regulatory Matters (Details) $ in Millions							1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 20, 2025 USD ($)	Sep. 30, 2025 USD ($)	May 30, 2025 USD ($)	Feb. 28, 2025 USD ($) MW	Oct. 16, 2018	Oct. 16, 2014	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 13, 2025 USD ($)	Mar. 13, 2025	Oct. 04, 2024 USD ($)	Apr. 26, 2024
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		$ 2,058						$ 2,060	$ 2,058		$ 2,058
aggregate projected capital expenditures				$ 3,700
Cane Run BESS
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
aggregate projected capital expenditures				775
Mill Creek NGCC
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
aggregate projected capital expenditures				$ 1,400
Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		$ 111						113	111		111
Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 391
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 391
Kentucky Public Service Commission [Member] | Electric and Gas Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 235
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 235
PPL Electric [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Distribution System Improvement Charge Cap				5.00%										7.50%		5.00%
PPL Electric [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase									439	$ 404	1,300	$ 1,200
PPL Electric [Member] | Pennsylvania Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Requested Distribution System Improvement Charge Cap																9.00%
Public Utilities, Requested Return on Equity, Percentage		11.30%
Public Utilities, Requested Return on Equity, Percentage		11.30%
PPL Electric [Member] | Pennsylvania Public Utility Commission | Electric Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 356
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.60%
Public Utilities, Requested Rate Increase (Decrease), Amount Already Included In Customer Bills		$ 50
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 356
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.60%
LGE [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Generation Unit | MW				645
CPCN Battery Storage Facility | MW				1,600
LGE [Member] | Mill Creek Unit 2
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Property, Plant and Equipment, Generation or Processing		$ 203							203		203
LGE [Member] | Kentucky Public Service Commission [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage			10.95%
Public Utilities, Requested Return on Equity, Percentage			10.95%
LGE [Member] | Kentucky Public Service Commission [Member] | Mill Creek Unit 1 retirement
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved															$ 125
LGE [Member] | Kentucky Public Service Commission [Member] | 2025 KY Storms | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		2							2		2
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Maximum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 105
Public Utilities, Requested Rate Increase (Decrease), Percentage			8.30%
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 105
Public Utilities, Requested Rate Increase (Decrease), Percentage			8.30%
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 58
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	58
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 60
Public Utilities, Requested Rate Increase (Decrease), Percentage			14.00%
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 60
Public Utilities, Requested Rate Increase (Decrease), Percentage			14.00%
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	45
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 45
KU [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Generation Unit | MW				645
KU [Member] | Kentucky Public Service Commission [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage			10.95%
Public Utilities, Requested Return on Equity, Percentage			10.95%
KU [Member] | Kentucky Public Service Commission [Member] | 2025 KY Storms | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		7							7		7
KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Maximum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 226
Public Utilities, Requested Rate Increase (Decrease), Percentage			11.50%
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 226
Public Utilities, Requested Rate Increase (Decrease), Percentage			11.50%
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 132
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 132
Rhode Island Energy
Regulatory Matters [Line Items]
Amount of Hold Harmless Obligation to be Credited to Customers in 2027													$ 81
Amount of Hold Harmless Obligation to be Credited to Customers in 2026													74
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Net Present Value of Hold Harmless Obligation													155
Net Present Value of Hold Harmless Obligation													$ 155
Rhode Island Energy | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase									90	80	$ 245	234
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%
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]
Public Utilities, Approved Return on Equity, Percentage						11.74%					11.74%
Rhode Island Energy | Rhode Island Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Contingency Plan Spend on FY 2026 Gas ISR Plan								15
Capital Investment Spend on FY 2026 Gas ISR Plan								187
Capital Investment Spend on FY 2026 Electric ISR Plan								248
Total Approved Spend on FY 2026 Gas ISR Plan							$ 165
Rhode Island Energy | Rhode Island Public Utility Commission | Other O&M
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Capital Investment Spend on FY 2026 Electric ISR Plan								1
Approved Capital Investment Spend on FY 2026 Electric ISR Plan							1
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Capital Investment Spend on FY 2026 Electric ISR Plan								14
Approved Capital Investment Spend on FY 2026 Electric ISR Plan							14
Rhode Island Energy | Rhode Island Public Utility Commission | AMF Capital Investment
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Approved Capital Investment Spend on FY 2025 Electric ISR Plan								88
Approved Capital Investment Spend on FY 2026 Electric ISR Plan							88
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Approved Capital Investment Spend on FY 2026 Electric ISR Plan							219
Rhode Island Energy | Rhode Island Public Utility Commission | Paving Costs
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Capital Investment Spend on FY 2026 Gas ISR Plan								22
Total Approved Spend on FY 2026 Gas ISR Plan							18
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Total Approved Spend on FY 2026 Gas ISR Plan							147
Approved Contingency Plan Spend on FY 2026 Gas ISR Plan							$ 15
PPL Electric Utilities Corp [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Distribution System Improvement Charge Cap				5.00%										7.50%		5.00%
Regulatory assets		703						673	703		$ 703
PPL Electric Utilities Corp [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		$ 41						22	41		41
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase									439	$ 404	1,300	$ 1,200
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Requested Distribution System Improvement Charge Cap																9.00%
Public Utilities, Requested Return on Equity, Percentage		11.30%
Public Utilities, Requested Return on Equity, Percentage		11.30%
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission | Electric Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 356
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.60%
Public Utilities, Requested Rate Increase (Decrease), Amount Already Included In Customer Bills		$ 50
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 356
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.60%
Louisville Gas And Electric Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		$ 485						491	485		485
CPCN NGCC Generation Unit | MW				645
BESS LG&E Planned Ownership Percentage				0.32
CPCN Battery Storage Facility | MW				1,600
Louisville Gas And Electric Co [Member] | Mill Creek Unit 2
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Property, Plant and Equipment, Generation or Processing		203							203		203
Louisville Gas And Electric Co [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		24						20	24		24
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage			10.95%
Public Utilities, Requested Return on Equity, Percentage			10.95%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Mill Creek Unit 1 retirement
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Amount of Regulatory Costs Not yet Approved															$ 125
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | 2025 KY Storms | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		2							2		2
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Maximum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 105
Public Utilities, Requested Rate Increase (Decrease), Percentage			8.30%
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 105
Public Utilities, Requested Rate Increase (Decrease), Percentage			8.30%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 60
Public Utilities, Requested Rate Increase (Decrease), Percentage			14.00%
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 60
Public Utilities, Requested Rate Increase (Decrease), Percentage			14.00%
Louisville Gas And Electric Co [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 58
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	58
Louisville Gas And Electric Co [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	45
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 45
Kentucky Utilities Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		458						458	458		458
CPCN NGCC Generation Unit | MW				645
BESS KU Planned Ownership Percentage				0.68
Kentucky Utilities Co [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		38						$ 29	38		38
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage			10.95%
Public Utilities, Requested Return on Equity, Percentage			10.95%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | 2025 KY Storms | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets		$ 7							$ 7		$ 7
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.90%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	9.40%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member] | Maximum [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage	10.15%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 226
Public Utilities, Requested Rate Increase (Decrease), Percentage			11.50%
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 226
Public Utilities, Requested Rate Increase (Decrease), Percentage			11.50%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 132
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 132