Amount of Hold Harmless Obligation to be Credited to Customers in the first quarter of 2026

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Amount of Hold Harmless Obligation to be Credited to Customers in first quarter of 2027

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Amount Approved March 26, 2024, to Spend on FY 2025 Electric ISR Plan

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Approved Capital Investment Spend on FY 2026 Electric ISR Plan

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Approved Contingency Plan Spend on FY 2026 Gas ISR Plan

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BESS KU Planned Ownership Percentage

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BESS LG&E Planned Ownership Percentage

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CPCN Aggregate Projected Capital Expenditures 2025-2031

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Capital Investment Spend on FY 2026 Electric ISR Plan

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Capital Investment Spend on FY 2026 Gas ISR Plan

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Contingency Plan Spend on FY 2026 Gas ISR Plan

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The limit on what can be charged as Distribution System Improvement Charges, which is defined as a percentage of billed revenue.

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Initial minimum base ROE to be reset by the FERC

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Net Present Value of Hold Harmless Obligation

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New ROE by National Grid along with other NETOs who filed a brief supporting FERC's new methodology and confirming the illustrative numbers that FERC arrived at in its order addressing all four complaints

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The expected remaining net book value of a regulated generation unit at its anticipated retirement date.

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Regulatory Matters Kentucky Activities Rate Case Proceedings [Abstract]

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New Distribution System Improvement Charge Cap requested from the PAPUC, defined as a percentage of billed revenue.

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Total Approved Spend on FY 2026 Gas ISR Plan

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Amount of increase from purchase of accounts receivable.

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Percentage of public utility's approved return on equity.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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-Topic 980
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Utility Rate Regulation - Regulatory Matters (Details) $ in Millions					1 Months Ended		3 Months Ended		6 Months Ended
	May 30, 2025 USD ($)	Feb. 28, 2025 USD ($) MW	Oct. 16, 2018	Oct. 16, 2014	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 13, 2025 USD ($)	Mar. 13, 2025	Oct. 04, 2024 USD ($)	Apr. 26, 2024
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets						$ 2,060	$ 2,055		$ 2,055
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						113	114		114
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
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							345	$ 348	811	$ 767
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							208		208
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement							161		161
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
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] \| 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%
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
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%
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							68	44	$ 155	95
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						673	692		$ 692
PPL Electric Utilities Corp [Member] \| Storm Costs [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets						22	42		42
PPL Electric Utilities Corp [Member] \| Unaffiliated Third Party Entity [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Accounts Receivable, Purchase							345	$ 348	811	$ 767
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	488		488
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							208		208
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						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
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%
Kentucky Utilities Co [Member]
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]
Regulatory assets						458	462		462
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						$ 29	37		37
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
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%