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ORGANIZATION AND BASIS OF PRESENTATION - Schedule of Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Goodwill	$ 5,618	$ 5,618
JERSEY CENTRAL POWER & LIGHT COMPANY
Property, Plant and Equipment [Line Items]
Goodwill	1,811	$ 1,811
Distribution Segment
Property, Plant and Equipment [Line Items]
Goodwill	3,222
Integrated Segment
Property, Plant and Equipment [Line Items]
Goodwill	1,953
Stand-Alone Transmission Segment
Property, Plant and Equipment [Line Items]
Goodwill	$ 443

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