REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Millions												3 Months Ended
	Jan. 13, 2023 USD ($)	Aug. 25, 2022 USD ($)	May 17, 2022 USD ($)	Dec. 29, 2021 USD ($)	Dec. 27, 2021 USD ($)	Dec. 17, 2021 USD ($)	Nov. 22, 2021 USD ($) plant MW	Nov. 18, 2021 USD ($)	Aug. 27, 2021 USD ($)	Aug. 30, 2019 USD ($)	Jun. 01, 2019 proposal	Dec. 31, 2021 USD ($)	Jun. 18, 2020
Pennsylvania | PPUC
Regulatory Matters [Line Items]
Revised requested rate increase								$ 61.0
Pennsylvania | PPUC | Utilities and Transmission Companies
Regulatory Matters [Line Items]
Pre-tax charges												$ 61.0
Pennsylvania | PPUC | Penn | ENEC Phase IV
Regulatory Matters [Line Items]
Approved demand reduction targets													2.00%
Approved energy consumption reduction targets													2.70%
Pennsylvania | PPUC | WP | ENEC Phase IV
Regulatory Matters [Line Items]
Approved demand reduction targets													2.50%
Approved energy consumption reduction targets													2.40%
Pennsylvania | PPUC | Pennsylvania Companies | DSP
Regulatory Matters [Line Items]
Number of RFP's | proposal											2
Project term											2 years
Pennsylvania | PPUC | Pennsylvania Companies | DSP | 3 Month Period
Regulatory Matters [Line Items]
Energy contract term											3 months
Pennsylvania | PPUC | Pennsylvania Companies | DSP | 12 Month Period
Regulatory Matters [Line Items]
Energy contract term											12 months
Pennsylvania | PPUC | Pennsylvania Companies | DSP | 24 Month Period
Regulatory Matters [Line Items]
Energy contract term											24 months
Pennsylvania | PPUC | Pennsylvania Companies | New LTIP's
Regulatory Matters [Line Items]
Cost recovery period										5 years
Requested rate increase (decrease)										$ 572.0
Pennsylvania | PPUC | PN | ENEC Phase IV
Regulatory Matters [Line Items]
Approved demand reduction targets													3.30%
Approved energy consumption reduction targets													3.00%
Pennsylvania | PPUC | ME | ENEC Phase IV
Regulatory Matters [Line Items]
Approved demand reduction targets													2.90%
Approved energy consumption reduction targets													3.10%
West Virginia | WVPSC | MP and PE
Regulatory Matters [Line Items]
Number of solar generation sites | plant							5
Solar generation plant capacity (in MW's) | MW							50
Public utilities, interim rate increase (decrease), amount			$ 94.0
West Virginia | WVPSC | MP and PE | Subsequent Event
Regulatory Matters [Line Items]
Requested amount of annual depreciation expense	$ 75.5
West Virginia | WVPSC | MP and PE | Ft. Martin and Harrison Power Stations
Regulatory Matters [Line Items]
Requested annual rate increase						$ 3.0
Requested rate increase (decrease)						$ 142.0
West Virginia | WVPSC | MP and PE | Solar Generation Project
Regulatory Matters [Line Items]
Solar generation plant capacity (in MW's) | MW							50,000,000
Expected cost of the program							$ 110.0
Percent of subscriptions required prior to commencement							85.00%
West Virginia | WVPSC | MP and PE | ENEC
Regulatory Matters [Line Items]
Approved amount of rate increase (decrease)		$ 92.0
Approved ROE		4.00%
Public utilities, supplemental approved annual rate increase (decrease), amount									$ (7.7)
Requested rate increase (decrease)		$ 183.8
Under recovered amount, percent		12.20%
Supplemental requested decrease		$ 144.9
West Virginia | WVPSC | MP and PE | Integrated Resource Plan
Regulatory Matters [Line Items]
Approved amount of rate increase (decrease)				$ 19.6
West Virginia | WVPSC | MP and PE | Vegetation Management Surcharge Rates
Regulatory Matters [Line Items]
Approved amount of rate increase (decrease)					$ 16.0
Surcharge period					2 years