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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | [1] | $ 3,287 | $ 3,231
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 3,300 | 3,245
Operating Segments | Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 1,746 | 1,798
Total revenues |  | 1,767 | 1,817
Operating Segments | Distribution | Wholesale |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 1 | 2
Operating Segments | Distribution | Other revenue from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 21 | 19
Operating Segments | Distribution | Other revenue unrelated to contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 21 | 19
Operating Segments | Integrated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 1,087 | 1,018
Total revenues |  | 1,095 | 1,028
Operating Segments | Integrated | Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 81 | 64
Operating Segments | Integrated | Wholesale |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 30 | 45
Operating Segments | Integrated | Other revenue from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 5 | 6
Operating Segments | Integrated | Other revenue unrelated to contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 8 | 10
Operating Segments | Stand-Alone Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 434 | 396
Total revenues |  | 438 | 400
Operating Segments | Stand-Alone Transmission | Other revenue unrelated to contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 4 | 4
Operating Segments | Residential | Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 1,184 | 1,171
Operating Segments | Residential | Integrated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 574 | 506
Operating Segments | Commercial | Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 374 | 377
Operating Segments | Commercial | Integrated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 252 | 256
Operating Segments | Industrial | Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 146 | 212
Operating Segments | Industrial | Integrated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 138 | 135
Operating Segments | Other | Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 20 | 17
Operating Segments | Other | Integrated |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 7 | 6
Operating Segments | ATSI | Stand-Alone Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 243 | 226
Operating Segments | TrAIL | Stand-Alone Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 67 | 66
Operating Segments | MAIT | Stand-Alone Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 104 | 89
Operating Segments | KATCo | Stand-Alone Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 20 | 15
Corporate/Other and Reconciling Adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | (13) | (14)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 3 | 2
Corporate/Other and Reconciling Adjustments | Other revenue unrelated to contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | $ (16) | $ (16)
[1] | Includes excise and gross receipts tax collections of $115 million and $109 million during the three months ended March 31, 2024 and 2023, respectively.

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