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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total revenues [1] $ 13,472 $ 12,870 $ 12,459
Operating Segments      
Disaggregation of Revenue [Line Items]      
Total revenues 13,526 12,922 12,492
Operating Segments | Distribution      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 6,783 6,779 6,353
Total revenues 6,863 6,854 6,425
Operating Segments | Distribution | Wholesale      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 6 20 19
Operating Segments | Distribution | Other revenue from contracts with customers      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 80 89 86
Operating Segments | Distribution | Other revenue unrelated to contracts with customers      
Disaggregation of Revenue [Line Items]      
Total revenues 80 75 72
Operating Segments | Distribution | Distribution services and retail generation | Ohio Stipulation      
Disaggregation of Revenue [Line Items]      
Rate refunds     58
Operating Segments | Integrated      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 4,824 4,285 4,442
Total revenues 4,876 4,320 4,470
Operating Segments | Integrated | Wholesale      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 146 208 475
Operating Segments | Integrated | Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 380 318 282
Operating Segments | Integrated | Other revenue from contracts with customers      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 19 24 17
Operating Segments | Integrated | Other revenue unrelated to contracts with customers      
Disaggregation of Revenue [Line Items]      
Total revenues 42 35 28
Operating Segments | Stand-Alone Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 1,768 1,731 1,581
Total revenues 1,787 1,748 1,597
Operating Segments | Stand-Alone Transmission | Other revenue unrelated to contracts with customers      
Disaggregation of Revenue [Line Items]      
Total revenues 19 17 16
Operating Segments | Residential | Distribution      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 4,514 4,344 3,954
Operating Segments | Residential | Integrated      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 2,528 2,137 2,121
Operating Segments | Commercial | Distribution      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 1,522 1,528 1,432
Operating Segments | Commercial | Integrated      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 1,142 1,023 1,016
Operating Segments | Industrial | Distribution      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 588 726 806
Operating Segments | Industrial | Integrated      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 577 545 505
Operating Segments | Other | Distribution      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 73 72 56
Operating Segments | Other | Integrated      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 32 30 26
Operating Segments | ARP | Integrated | Other revenue unrelated to contracts with customers      
Disaggregation of Revenue [Line Items]      
Total revenues 10 0 0
Operating Segments | ATSI | Stand-Alone Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 980 967 911
Operating Segments | TrAIL | Stand-Alone Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 269 279 270
Operating Segments | MAIT | Stand-Alone Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 436 394 340
Operating Segments | KATCo | Stand-Alone Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 85 89 59
Operating Segments | Other | Stand-Alone Transmission      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers (2) 2 1
Corporate/Other and Reconciling Adjustments      
Disaggregation of Revenue [Line Items]      
Total revenues (54) (52) (33)
Corporate/Other and Reconciling Adjustments | Wholesale      
Disaggregation of Revenue [Line Items]      
Total revenues from contracts with customers 9 11 27
Corporate/Other and Reconciling Adjustments | Eliminations and reconciling adjustments      
Disaggregation of Revenue [Line Items]      
Total revenues $ (63) $ (63) $ (60)
[1] Includes excise and gross receipts tax collections of $429 million, $420 million and $406 million in 2024, 2023 and 2022, respectively.