RATE MATTERS - KPCo Rate Matters (Details) $ in Millions		1 Months Ended
	Feb. 12, 2026 USD ($)	Jan. 31, 2026 USD ($)	Oct. 31, 2025 USD ($)	Aug. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jan. 31, 2025 USD ($)	Feb. 29, 2024 USD ($)	Jan. 31, 2024 USD ($)	Nov. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2025 USD ($) MW	Dec. 31, 2024 USD ($)	Jul. 31, 2021
Public Utilities, General Disclosures [Line Items]
Utility Plant in Service												$ 1,926	$ 1,921
KPCo | Mitchell Plant
Public Utilities, General Disclosures [Line Items]
Percent of Ownership												50.00%
Jointly owned utility plant, generation capacity | MW												1,560
Proportionate energy and capacity share					50.00%
Utility Plant in Service												$ 523
KPCo | Mitchell Plant ELG investments
Public Utilities, General Disclosures [Line Items]
Percent of Ownership														50.00%
Estimated cost to be recovered					$ 78
KPCo | Mitchell Plant Non-ELG Capital Investments
Public Utilities, General Disclosures [Line Items]
Estimated cost to be recovered					$ 60
Wheeling Power Company | Mitchell Plant ELG investments
Public Utilities, General Disclosures [Line Items]
Ownership percentage selling														100.00%
Wheeling Power Company | Mitchell Plant
Public Utilities, General Disclosures [Line Items]
Percent of Ownership												50.00%
Wheeling Power Company | Mitchell Plant ELG investments
Public Utilities, General Disclosures [Line Items]
Proportionate ownership share requested to be transferred					50.00%
Wheeling Power Company | Mitchell Plant Non-ELG Capital Investments
Public Utilities, General Disclosures [Line Items]
Percent of Ownership														50.00%
Proportionate ownership share requested to be transferred					50.00%
2023 Kentucky Base Rate and Securitization Case | KPCo
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)											$ 94
Requested return on equity											9.90%
Requested securitization bonds regulatory assets recovery											$ 471
Settlement agreement annual increase										$ 75
Settlement agreement return on common equity										9.75%
Settlement agreement securitization bonds regulatory assets recovery										$ 471
Approved net increase in Kentucky annual revenues									$ 60
Approved return on equity									9.75%
Reduction in revenue requirement for recovery of actual test year pjm transmission costs							$ 14	$ 14	$ 14
Order entered in mandated period							30 days
Request to defer transmission costs, amount denied						$ 16
Recovery of costs, approved			$ 16
Recovery of costs, period			22 months
Regulatory assets expected to be recovered through securitization					$ 500
2023 Kentucky Base Rate and Securitization Case | KPCo | Mitchell Plant
Public Utilities, General Disclosures [Line Items]
Percent of Ownership											50.00%
2023 Kentucky Base Rate and Securitization Case | KPCo | Asset Retirement Obligation Costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets expected to be recovered through securitization					311
2023 Kentucky Base Rate and Securitization Case | KPCo | Storm-Related Costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets expected to be recovered through securitization					79
2023 Kentucky Base Rate and Securitization Case | KPCo | Under-Recovered Purchased Power Rider Costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets expected to be recovered through securitization					56
2023 Kentucky Base Rate and Securitization Case | KPCo | Deferred Purchased Power Expenses
Public Utilities, General Disclosures [Line Items]
Regulatory assets expected to be recovered through securitization					51
2023 Kentucky Base Rate and Securitization Case | KPCo | Issuance Expenses
Public Utilities, General Disclosures [Line Items]
Regulatory assets expected to be recovered through securitization					3
2023 Kentucky Base Rate and Securitization Case | KPCo | Securitization Bonds
Public Utilities, General Disclosures [Line Items]
Total issuances					478
Non-utility issuance costs					6
Securitized offset for net present value of return on ADIT					$ 29
2025 Kentucky Base Rate Case | KPCo
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)				$ 96
Requested return on equity				10.00%
Requested debt capital structure				53.90%
Requested equity capital structure				46.10%
Increase in PJM transmission costs				$ 10
Increase due to load loss				9
Requested rate increase related to depreciation rates				6
2025 Kentucky Base Rate Case | KPCo | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)	$ 40	$ 59
Requested return on equity	8.90%	9.80%
Approved return on equity		9.70%
Requested debt capital structure	55.00%	53.90%
Requested equity capital structure	45.00%	46.10%
Requested retail rate increase (decrease), amount		$ 77
First year revenue requirement		18
Settlement revenue requirement rate decrease year one	$ 49	25
Settlement revenue requirement rate decrease year two	$ 28	15
Requested deferred costs, maximum, year one		45
Requested deferred costs, maximum, year two		$ 52
2025 Kentucky Base Rate Case | KPCo | Mitchell Plant
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)				$ 20
2025 Kentucky Base Rate Case | KPCo | Mitchell Plant Non-ELG Capital Investments | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested recovery amount, restricted period	3 years