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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | [1] | $ 3,729 | $ 3,487 | $ 10,296 | $ 9,724
Operating Segments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 3,744 | 3,500 | 10,338 | 9,764
Operating Segments | Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,798 | 1,777 | 5,173 | 5,184
Total revenues |  | 1,817 | 1,795 | 5,232 | 5,239
Operating Segments | Distribution | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2 | 7 | 4 | 20
Operating Segments | Distribution | Other revenue from contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 23 | 23 | 63 | 69
Operating Segments | Distribution | Other revenue unrelated to contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 19 | 18 | 59 | 55
Operating Segments | Integrated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,437 | 1,259 | 3,694 | 3,223
Total revenues |  | 1,452 | 1,266 | 3,725 | 3,250
Operating Segments | Integrated | Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 86 | 74 | 283 | 224
Operating Segments | Integrated | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 50 | 58 | 118 | 153
Operating Segments | Integrated | Other revenue from contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 5 | 5 | 18 | 17
Operating Segments | Integrated | Other revenue unrelated to contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 15 | 7 | 31 | 27
Operating Segments | Stand-Alone Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 470 | 434 | 1,367 | 1,262
Total revenues |  | 475 | 439 | 1,381 | 1,275
Operating Segments | Stand-Alone Transmission | Other revenue unrelated to contracts with customers |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 5 | 5 | 14 | 13
Operating Segments | Residential | Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,222 | 1,174 | 3,460 | 3,312
Operating Segments | Residential | Integrated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 802 | 692 | 1,954 | 1,621
Operating Segments | Commercial | Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 395 | 405 | 1,153 | 1,156
Operating Segments | Commercial | Integrated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 335 | 281 | 863 | 777
Operating Segments | Industrial | Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 138 | 150 | 437 | 575
Operating Segments | Industrial | Integrated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 151 | 140 | 436 | 408
Operating Segments | Other | Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 18 | 18 | 56 | 52
Operating Segments | Other | Integrated |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 8 | 9 | 22 | 23
Operating Segments | ATSI | Stand-Alone Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 262 | 245 | 766 | 712
Operating Segments | TrAIL | Stand-Alone Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 68 | 72 | 206 | 204
Operating Segments | MAIT | Stand-Alone Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 116 | 101 | 330 | 288
Operating Segments | KATCo | Stand-Alone Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 24 | 16 | 67 | 58
Operating Segments | Other | Stand-Alone Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | (2) | 0
Corporate/Other and Reconciling Adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | (15) | (13) | (42) | (40)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2 | 1 | 6 | 6
Corporate/Other and Reconciling Adjustments | Eliminations and reconciling adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | $ (17) | $ (14) | $ (48) | $ (46)
[1] | Includes excise and gross receipts tax collections of $116 million and $114 million during the three months ended September 30, 2024 and 2023, respectively, and $329 million and $315 million during the nine months ended September 30, 2024 and 2023, respectively.

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