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FAIR VALUE MEASUREMENTS - Schedule of Fair Value and Related Carrying Amounts of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Carrying value
Fair value and related carrying amounts of long-term debt and other long-term obligations
Long-term debt	$ 27,340	$ 23,594
Carrying value | JERSEY CENTRAL POWER & LIGHT COMPANY
Fair value and related carrying amounts of long-term debt and other long-term obligations
Long-term debt	3,700	2,350
Fair value
Fair value and related carrying amounts of long-term debt and other long-term obligations
Long-term debt	26,727	22,128
Fair value | JERSEY CENTRAL POWER & LIGHT COMPANY
Fair value and related carrying amounts of long-term debt and other long-term obligations
Long-term debt	$ 3,707	$ 2,284

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- Definition

Fair value and related carrying amounts of long-term debt and other long-term obligations.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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