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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenues [1] $ 4,148 $ 3,729 $ 11,293 $ 10,296
JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues 864 765 2,022 1,788
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues 4,161 3,744 11,329 10,338
Operating Segments | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues 908 804 2,153 1,903
Operating Segments | Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,000 1,798 5,568 5,173
Total revenues 2,020 1,817 5,631 5,232
Operating Segments | Distribution | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 840 746 1,959 1,726
Total revenues 841 747 1,962 1,728
Operating Segments | Distribution | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6 2 10 4
Operating Segments | Distribution | Wholesale | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 2 3 4
Operating Segments | Distribution | Other revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23 23 60 63
Operating Segments | Distribution | Other revenue from contracts with customers | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3 4 10 14
Operating Segments | Distribution | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 20 19 63 59
Operating Segments | Distribution | Other revenue unrelated to contracts with customers | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues 1 1 3 2
Operating Segments | Integrated        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,642 1,437 4,235 3,694
Total revenues 1,653 1,452 4,263 3,725
Operating Segments | Integrated | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 129 50 254 118
Operating Segments | Integrated | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 109 86 320 283
Operating Segments | Integrated | Other revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 5 7 18
Operating Segments | Integrated | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 11 15 28 31
Operating Segments | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 483 470 1,420 1,367
Total revenues 488 475 1,435 1,381
Operating Segments | Stand-Alone Transmission | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 5 5 15 14
Operating Segments | Transmission Segment | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues 67 57 191 175
Operating Segments | Residential | Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,333 1,222 3,685 3,460
Operating Segments | Residential | Distribution | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 606 533 1,318 1,168
Operating Segments | Residential | Integrated        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 880 802 2,186 1,954
Operating Segments | Commercial | Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 450 395 1,274 1,153
Operating Segments | Commercial | Distribution | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 204 183 554 473
Operating Segments | Commercial | Integrated        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 356 335 981 863
Operating Segments | Industrial | Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 170 138 484 437
Operating Segments | Industrial | Distribution | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 19 18 57 52
Operating Segments | Industrial | Integrated        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 158 151 461 436
Operating Segments | Other | Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 18 18 55 56
Operating Segments | Other | Distribution | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6 6 17 15
Operating Segments | Other | Integrated        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 8 8 26 22
Operating Segments | ATSI | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 273 262 791 766
Operating Segments | TrAIL | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 66 68 197 206
Operating Segments | MAIT | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 121 116 365 330
Operating Segments | KATCo | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23 24 67 67
Operating Segments | Other | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 (2)
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues (13) (15) (36) (42)
Corporate/Other and Reconciling Adjustments | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4 2 12 6
Corporate/Other and Reconciling Adjustments | Eliminations and reconciling adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues (17) (17) (48) (48)
Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues (17) (17) (48) (48)
Reconciling Adjustments | JERSEY CENTRAL POWER & LIGHT COMPANY        
Disaggregation of Revenue [Line Items]        
Total revenues $ (44) $ (39) $ (131) $ (115)
[1] Includes excise and gross receipts tax collections of $126 million and $116 million during the three months ended September 30, 2025 and 2024, respectively, and $349 million and $329 million during the nine months ended September 30, 2025 and 2024, respectively.