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FAIR VALUE MEASUREMENTS - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 12, 2025 USD ($) tradingDay consecutiveTradingDay $ / shares	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 05, 2024 USD ($)
Fair Value of Financial Instruments [Line Items]
Investments not required to be disclosed		$ 383	$ 383		$ 383		$ 370
Repayments of debt					2,155	$ 1,386
JERSEY CENTRAL POWER & LIGHT COMPANY
Fair Value of Financial Instruments [Line Items]
Repayments of debt					0	500
Unsecured Debt | JERSEY CENTRAL POWER & LIGHT COMPANY | Senior Notes Maturity 2035
Fair Value of Financial Instruments [Line Items]
Face amount of debt								$ 700
Convertible Debt | 3.625%, Convertible Notes Maturity 2029
Fair Value of Financial Instruments [Line Items]
Face amount of debt	$ 1,350
Convertible Debt | 3.875%, Convertible Notes Maturity 2031
Fair Value of Financial Instruments [Line Items]
Face amount of debt	1,150
Convertible Debt | Convertible Notes Maturity 2029 & 2031
Fair Value of Financial Instruments [Line Items]
Proceeds from issuance of debt	$ 2,470
Debt instrument, convertible, conversion ratio	0.0209275
Debt instrument, conversion price (in dollars per share) | $ / shares	$ 47.78
Debt instrument convertible premium	20.00%
Redemption price, percentage	100.00%
Convertible Debt | Convertible Notes Maturity 2029 & 2031 | Debt Conversion Terms Two
Fair Value of Financial Instruments [Line Items]
Debt instrument, convertible, threshold trading days | consecutiveTradingDay	5
Debt instrument, convertible, threshold consecutive trading days | consecutiveTradingDay	10
Threshold trading days measurement period | tradingDay	10
Debt instrument, measurement period percentage	98.00%
Convertible Debt | Convertible Notes Maturity 2029 & 2031 | Debt Conversion Terms One
Fair Value of Financial Instruments [Line Items]
Debt instrument, convertible, threshold trading days | tradingDay	20
Debt instrument, convertible, threshold consecutive trading days | tradingDay	30
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Convertible Debt | Convertible Notes Maturity 2029
Fair Value of Financial Instruments [Line Items]
Issuance interest rate	3.625%
Convertible Debt | Convertible Notes Maturity 2031
Fair Value of Financial Instruments [Line Items]
Issuance interest rate	3.875%
Convertible Debt | Convertible Notes 2026
Fair Value of Financial Instruments [Line Items]
Repayments of debt		$ 1,200
Corporate-Owned Life Insurance
Fair Value of Financial Instruments [Line Items]
Gain on investments			$ 7	$ 1	$ 9	$ 10

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