SEGMENT INFORMATION - Narrative (Details) customer in Millions, $ in Billions				3 Months Ended	6 Months Ended
	Feb. 18, 2026 MW	Feb. 13, 2026 USD ($) MW	Oct. 01, 2025 MW	Mar. 31, 2026 site	Jun. 30, 2026 USD ($) segment customer site MW	Dec. 31, 2025 MW
Segment Reporting [Line Items]
Number of customers \| customer					6.0
MP and PE \| Solar Generation Project \| West Virginia \| WVPSC
Segment Reporting [Line Items]
Public utilities, near-term market capacity purchases (in MV's)	70	70	70
MP and PE \| Natural Gas Generation Project \| West Virginia \| WVPSC
Segment Reporting [Line Items]
Public utilities, near-term market capacity purchases (in MV's)	1,200	1,200	1,200
Estimated initial investment \| $		$ 2.7
JCP&L
Segment Reporting [Line Items]
Number of customers \| customer					1.2
Number of reportable segments \| segment					1
Distribution Segment
Segment Reporting [Line Items]
Number of customers \| customer					4.3
Integrated Segment
Segment Reporting [Line Items]
Number of customers \| customer					2.0
Plant capacity (in MW's)					3,610
Other Business Operations \| FE
Segment Reporting [Line Items]
Long-term debt \| $					$ 7.4
Other Business Operations \| OVEC
Segment Reporting [Line Items]
Plant capacity (in MW's)					67
Integrated \| MP and PE \| Solar Generation Project
Segment Reporting [Line Items]
Number of completed solar sites \| site				3	3
Integrated \| MP and PE \| Solar Generation Project \| West Virginia
Segment Reporting [Line Items]
Plant capacity (in MW's)						30