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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | [1] | $ 12,459 | $ 11,132 | $ 10,790
Operating Segments | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 10,700 | 9,644 | 9,227
Total revenues |  | 10,801 | 9,711 | 9,363
Operating Segments | Utilities and Transmission Companies | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 494 | 362 | 251
Operating Segments | Utilities and Transmission Companies | Other revenue from contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 104 | 119 | 140
Operating Segments | Utilities and Transmission Companies | ARP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 0 | (27) | 43
Operating Segments | Utilities and Transmission Companies | Other revenue unrelated to contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 101 | 94 | 93
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 |  | 1,863 | 1,608 | 1,613
Total revenues |  | 1,868 | 1,618 | 1,630
Operating Segments | Regulated Transmission | Other revenue unrelated to contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 5 | 10 | 17
Operating Segments | Residential | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 6,180 | 5,713 | 5,539
Operating Segments | Commercial | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 2,499 | 2,284 | 2,140
Operating Segments | Industrial | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 1,338 | 1,091 | 1,076
Operating Segments | Other | Utilities and Transmission Companies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 85 | 75 | 81
Operating Segments | ATSI | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 912 | 799 | 804
Operating Segments | TrAIL | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 270 | 233 | 247
Operating Segments | MAIT | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 340 | 288 | 250
Operating Segments | JCP&L | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 203 | 164 | 178
Operating Segments | MP, PE and WP | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 138 | 124 | 134
Corporate/Other and Reconciling Adjustments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | (210) | (197) | (203)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 27 | 14 | 9
Corporate/Other and Reconciling Adjustments | Other revenue unrelated to contracts with customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | (51) | (57) | (64)
Corporate/Other and Reconciling Adjustments | Retail generation and distribution services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | $ (186) | $ (154) | $ (148)
[1] | Includes excise and gross receipts tax collections of $406 million, $374 million and $362 million in 2022, 2021 and 2020, respectively.

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