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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.

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