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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 10,437    
Income tax on other comprehensive income 1 $ (1) $ (1)
Other comprehensive income, net of tax 3 (3) 1
Ending balance 12,455 10,437  
Total FirstEnergy Corp. AOCI      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (17) (14) (15)
Other comprehensive income, net of tax 3 (3) 1
Ending balance (14) (17) (14)
Gains & Losses on Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 2 0 (7)
Amounts reclassified from AOCI 3 2 9
Income tax on other comprehensive income 1 0 2
Other comprehensive income, net of tax 2 2 7
Ending balance 4 2 0
Defined Benefit Pension & OPEB Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (19) (14) (8)
Amounts reclassified from AOCI 1 (6) (9)
Income tax on other comprehensive income 0 (1) (3)
Other comprehensive income, net of tax 1 (5) (6)
Ending balance $ (18) $ (19) $ (14)