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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | [1] | $ 12,870 | $ 12,459 | $ 11,132
Operating Segments | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 10,927 | 10,700 | 9,644
Total revenues |  | 11,038 | 10,801 | 9,711
Operating Segments | Utilities and Transmission Companies | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 228 | 494 | 362
Operating Segments | Utilities and Transmission Companies | Other revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 113 | 104 | 119
Operating Segments | Utilities and Transmission Companies | Alternative Revenue Program |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 0 | 0 | (27)
Operating Segments | Utilities and Transmission Companies | Other revenue unrelated to contacts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 111 | 101 | 94
Operating Segments | Utilities and Transmission Companies | Distribution services and retail generation | Ohio Stipulation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Rate refunds |  |  | 58 | 38
Operating Segments | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 2,049 | 1,863 | 1,608
Total revenues |  | 2,054 | 1,868 | 1,618
Operating Segments | Regulated Transmission | Other revenue unrelated to contacts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 5 | 5 | 10
Operating Segments | Residential | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 6,583 | 6,180 | 5,713
Operating Segments | Commercial | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 2,600 | 2,499 | 2,284
Operating Segments | Industrial | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 1,298 | 1,338 | 1,091
Operating Segments | Street lighting/Other | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 105 | 85 | 75
Operating Segments | ATSI | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 968 | 912 | 799
Operating Segments | TrAIL | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 279 | 270 | 233
Operating Segments | MAIT | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 395 | 340 | 288
Operating Segments | JCP&L | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 205 | 203 | 164
Operating Segments | MP, PE and WP | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 202 | 138 | 124
Corporate/Other and Reconciling Adjustments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | (222) | (210) | (197)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 11 | 27 | 14
Corporate/Other and Reconciling Adjustments | Other revenue unrelated to contacts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | (52) | (51) | (57)
Corporate/Other and Reconciling Adjustments | Retail generation and distribution services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | $ (181) | $ (186) | $ (154)
[1] | Includes excise and gross receipts tax collections of $420 million, $406 million and $374 million in 2023, 2022 and 2021, respectively.

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