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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | [1] | $ 3,487 | $ 3,475 | $ 9,724 | $ 9,282
Operating Segments | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 3,009 | 2,999 | 8,319 | 7,960
Total revenues |  | 3,034 | 3,023 | 8,402 | 8,038
Operating Segments | Regulated Distribution | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 65 | 159 | 173 | 408
Operating Segments | Regulated Distribution | Other revenue from contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 30 | 27 | 86 | 82
Operating Segments | Regulated Distribution | Other revenue unrelated to contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 25 | 24 | 83 | 78
Operating Segments | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 508 | 502 | 1,486 | 1,393
Total revenues |  | 509 | 503 | 1,490 | 1,397
Operating Segments | Regulated Transmission | Other revenue unrelated to contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 1 | 1 | 4 | 4
Operating Segments | Residential | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,894 | 1,756 | 5,010 | 4,608
Operating Segments | Commercial | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 698 | 686 | 1,970 | 1,858
Operating Segments | Industrial | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 296 | 348 | 1,002 | 943
Operating Segments | Other | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 26 | 23 | 78 | 61
Operating Segments | ATSI | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 244 | 252 | 712 | 686
Operating Segments | TrAIL | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 72 | 78 | 203 | 205
Operating Segments | MAIT | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 101 | 97 | 289 | 253
Operating Segments | JCP&L | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 52 | 45 | 152 | 151
Operating Segments | MP, PE and WP | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 39 | 30 | 130 | 98
Corporate/Other and Reconciling Adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | (56) | (51) | (168) | (153)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1 | 7 | 6 | 21
Corporate/Other and Reconciling Adjustments | Other revenue unrelated to contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | (12) | (12) | (38) | (38)
Corporate/Other and Reconciling Adjustments | Retail Generation and Distribution Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ (45) | $ (46) | $ (136) | $ (136)
[1] | Includes excise and gross receipts tax collections of $114 million and $111 million during the three months ended September 30, 2023 and 2022, respectively, and $315 million and $305 million during the nine months ended September 30, 2023 and 2022, respectively.

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