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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | [1] | $ 3,006 | $ 2,818 | $ 6,237 | $ 5,807
Operating Segments | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2,514 | 2,403 | 5,310 | 4,961
Total revenues |  | 2,542 | 2,426 | 5,368 | 5,015
Operating Segments | Regulated Distribution | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 61 | 159 | 108 | 249
Operating Segments | Regulated Distribution | Other Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 32 | 29 | 56 | 55
Operating Segments | Regulated Distribution | Product and Service, Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 28 | 23 | 58 | 54
Operating Segments | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 518 | 440 | 978 | 891
Total revenues |  | 520 | 441 | 981 | 894
Operating Segments | Regulated Transmission | Product and Service, Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 2 | 1 | 3 | 3
Operating Segments | Residential | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,414 | 1,310 | 3,116 | 2,852
Operating Segments | Commercial | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 627 | 575 | 1,272 | 1,172
Operating Segments | Industrial | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 353 | 312 | 706 | 595
Operating Segments | Other | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 27 | 18 | 52 | 38
Operating Segments | ATSI | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 242 | 217 | 468 | 434
Operating Segments | TrAIL | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 65 | 64 | 131 | 127
Operating Segments | MAIT | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 99 | 77 | 188 | 156
Operating Segments | JCP&L | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 57 | 46 | 100 | 106
Operating Segments | MP, PE and WP | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 55 | 36 | 91 | 68
Corporate/Other and Reconciling Adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | (56) | (49) | (112) | (102)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 3 | 8 | 5 | 14
Corporate/Other and Reconciling Adjustments | Product and Service, Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | (13) | (12) | (26) | (26)
Corporate/Other and Reconciling Adjustments | Retail Generation and Distribution Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ (46) | $ (45) | $ (91) | $ (90)
[1] | Includes excise and gross receipts tax collections of $92 million and $91 million during the three months ended June 30, 2023 and 2022, respectively, and $201 million and $194 million during the six months ended June 30, 2023 and 2022, respectively.

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