Utility Rate Regulation - Regulatory Matters (Details) $ in Millions				1 Months Ended		3 Months Ended
	Feb. 28, 2025 USD ($) MW	Oct. 16, 2018	Oct. 16, 2014	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 13, 2025	Oct. 04, 2024 USD ($)	Apr. 26, 2024
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				$ 2,049	$ 2,060	$ 2,049
aggregate projected capital expenditures	$ 3,700
Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				116	113	116
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						466	$ 419
PPL Electric [Member] | Pennsylvania Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Requested Distribution System Improvement Charge Cap										9.00%
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				215		215
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement				161		161
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] | January 2025 KY Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				2		2
KU [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
CPCN NGCC Generation Unit | MW	645
KU [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				7		7
Rhode Island Energy | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase						$ 87	51
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				685	673	$ 685
PPL Electric Utilities Corp [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				41	22	41
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase						466	$ 419
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Requested Distribution System Improvement Charge Cap										9.00%
Louisville Gas And Electric Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				491	491	491
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				215		215
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement				161		161
Louisville Gas And Electric Co [Member] | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				22	20	22
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] | January 2025 KY Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				2		2
Kentucky Utilities Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				460	458	460
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				36	$ 29	36
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm | Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets				$ 7		$ 7