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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Millions															3 Months Ended	12 Months Ended
	Sep. 13, 2024 USD ($)	Jul. 22, 2024 USD ($)	Apr. 02, 2024 USD ($)	Mar. 26, 2024 USD ($)	Jan. 23, 2024 USD ($)	Nov. 30, 2023 USD ($)	Aug. 31, 2023 USD ($)	Aug. 22, 2023 USD ($)	May 31, 2023 USD ($)	Apr. 24, 2023 MW	Jan. 13, 2023 USD ($)	May 01, 2022 MW	Nov. 22, 2021 site	Jan. 16, 2020 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Pennsylvania | ENEC Phase IV | PPUC
Regulatory Matters [Line Items]
Public utilities, approved energy consumption reduction targets, cost recovery																$ 390.0
Pennsylvania | ENEC Phase IV | PPUC | ME
Regulatory Matters [Line Items]
Demand reduction targets																2.90%
Energy consumption reduction targets																3.10%
Pennsylvania | ENEC Phase IV | PPUC | PN
Regulatory Matters [Line Items]
Demand reduction targets																3.30%
Energy consumption reduction targets																3.00%
Pennsylvania | ENEC Phase IV | PPUC | Penn
Regulatory Matters [Line Items]
Demand reduction targets																2.00%
Energy consumption reduction targets																2.70%
Pennsylvania | ENEC Phase IV | PPUC | WP
Regulatory Matters [Line Items]
Demand reduction targets																2.50%
Energy consumption reduction targets																2.40%
Pennsylvania | New LTIP's | PPUC | Pennsylvania Companies
Regulatory Matters [Line Items]
Recovery period														5 years
Public utilities, approved project, total capital investments														$ 572.0
Public utilities, requested program phase approval, proposed investment amount		$ 1,600.0
Pennsylvania | Long-Term Infrastructure Improvement Plan From 2025-2029 | PPUC | Pennsylvania Companies
Regulatory Matters [Line Items]
Public utilities, requested program phase approval, proposed investment amount		$ 1,400.0
Pennsylvania | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | PPUC | FE PA | Distribution
Regulatory Matters [Line Items]
Increase base distribution rate			$ 502.0
Allowed ROE			11.30%
Allowed debt			46.20%
Approved capital structure			53.80%
Public utilities, net average rate increase, percentage			0.077
Public utilities, residential rate increase, percentage			0.105
Pennsylvania | Enhanced Vegetation Management Program | PPUC | FE PA | Distribution
Regulatory Matters [Line Items]
Recovery period			10 years
Amount of requested rate increase	$ 225.0
West Virginia | WVPSC | MP and PE
Regulatory Matters [Line Items]
Amount of requested rate increase									$ 207.0
Approved amount of rate increase (decrease)				$ 105.0	$ 105.0
Requested amount of annual depreciation expense									$ 75.0		$ 76.0
Increase in annual amount of depreciation expense					$ 33.0			$ 33.0
Public utilities, approved rate increase, amount of income (loss) from continuing operations before equity method investments, income taxes, noncontrolling interest															$ 60.0
West Virginia | WVPSC | MP and PE | Solar Generation Project
Regulatory Matters [Line Items]
Percent of subscriptions required prior to commencement												85.00%
Plant capacity (in MW's) | MW										30		50
Number of approved solar sites | site													3
West Virginia | ENEC | WVPSC | MP and PE
Regulatory Matters [Line Items]
Amount of requested rate increase							$ 167.5
Under recovered amount, percent							9.90%
Deferred requested rate increase							$ 92.0
Supplemental requested decrease							267.0
Amount not recovered							$ 75.6
Public utilities, requested under recovery, not recovered, carrying charge, percent							0.04
Approved amount of rate increase (decrease)						$ 55.4
Recovery amounts						50.0
West Virginia | Expanded Net Energy Cost Through 2026 | WVPSC | MP and PE
Regulatory Matters [Line Items]
Approved amount of rate increase (decrease)						$ 184.0

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