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FAIR VALUE MEASUREMENTS - Schedule of Long-term Debt Redemption and Issuance (Details) - USD ($) $ in Millions	1 Months Ended				6 Months Ended
	Jun. 30, 2025	May 31, 2025	Apr. 30, 2025	Mar. 31, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 12, 2025
Debt Instrument [Line Items]
Repayments of debt					$ 2,155	$ 1,386
Debt issuances					$ 4,125	$ 400
2.050% Unsecured Senior Notes Maturity 2025 | Unsecured Notes | FE
Debt Instrument [Line Items]
Issuance interest rate				2.05%
Repayments of debt				$ 300
3.76% Unsecured Senior Notes Maturing 2025 | Unsecured Notes | TrAIL
Debt Instrument [Line Items]
Issuance interest rate		3.76%
Repayments of debt		$ 75
3.85% Unsecured Senior Notes Maturing 2025 | Unsecured Notes | TrAIL
Debt Instrument [Line Items]
Issuance interest rate	3.85%				3.85%
Repayments of debt	$ 550
4.00% Unsecured Senior Notes Maturing 2026 | Convertible Debt | FE
Debt Instrument [Line Items]
Issuance interest rate	4.00%				4.00%
Repayments of debt	$ 1,206
Repayments of long-term debt including premium	1,225
Make-whole premium	$ 19				$ 19
5.00%, $600 Million Notes Maturity 2031 | Unsecured Notes | TrAIL
Debt Instrument [Line Items]
Issuance interest rate			5.00%
Debt issuances			$ 600
5.00% Unsecured Senior Notes Maturing 2030 | Unsecured Notes | ATSI
Debt Instrument [Line Items]
Issuance interest rate		5.00%
Debt issuances		$ 225
4.95% Unsecured Senior Notes Maturing 2029 | Unsecured Notes | OE
Debt Instrument [Line Items]
Issuance interest rate		4.95%
Debt issuances		$ 300
5.00% Secured Senior Notes Maturing 2031 | Unsecured Notes | MAIT
Debt Instrument [Line Items]
Issuance interest rate	5.00%				5.00%
Debt issuances	$ 200
5.00%, 200 Million Notes Maturing 2030 | First Mortgage Bond | PE
Debt Instrument [Line Items]
Issuance interest rate	5.00%				5.00%
Debt issuances	$ 200
5.18%, $100 Million Notes Maturity 2030 | Senior Notes | TE
Debt Instrument [Line Items]
Issuance interest rate	5.18%				5.18%
Debt issuances	$ 100
3.63%, $1,350 Million Notes Maturity 2029 | Convertible Debt | FE
Debt Instrument [Line Items]
Issuance interest rate	3.63%				3.63%
Debt issuances	$ 1,350
3.88%, $1,150 Million Notes Maturity 2031 | Convertible Debt | FE
Debt Instrument [Line Items]
Issuance interest rate	3.88%				3.88%
Debt issuances	$ 1,150
Convertible Notes Maturity 2029 | Convertible Debt
Debt Instrument [Line Items]
Issuance interest rate							3.625%
Convertible Notes Maturity 2031 | Convertible Debt
Debt Instrument [Line Items]
Issuance interest rate							3.875%

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