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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total revenues [1] $ 3,280 $ 3,006 $ 6,567 $ 6,237
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues 3,294 3,019 6,594 6,264
Operating Segments | Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,629 1,609 3,375 3,407
Total revenues 1,648 1,627 3,415 3,444
Operating Segments | Distribution | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1 11 2 13
Operating Segments | Distribution | Other revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 19 27 40 46
Operating Segments | Distribution | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 19 18 40 37
Operating Segments | Distribution | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,054 967 2,238 2,138
Operating Segments | Distribution | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 384 374 758 751
Operating Segments | Distribution | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 153 213 299 425
Operating Segments | Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 18 17 38 34
Operating Segments | Integrated        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,170 946 2,257 1,964
Total revenues 1,178 956 2,273 1,984
Operating Segments | Integrated | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 116 86 197 150
Operating Segments | Integrated | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 38 50 68 95
Operating Segments | Integrated | Other revenue from contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 8 6 13 12
Operating Segments | Integrated | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 8 10 16 20
Operating Segments | Integrated | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 578 423 1,152 929
Operating Segments | Integrated | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 276 240 528 496
Operating Segments | Integrated | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 147 133 285 268
Operating Segments | Integrated | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7 8 14 14
Operating Segments | Stand-Alone Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 463 432 897 828
Total revenues 468 436 906 836
Operating Segments | Stand-Alone Transmission | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 5 4 9 8
Operating Segments | Stand-Alone Transmission | ATSI        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 261 241 504 467
Operating Segments | Stand-Alone Transmission | TrAIL        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 71 66 138 132
Operating Segments | Stand-Alone Transmission | MAIT        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 110 98 214 187
Operating Segments | Stand-Alone Transmission | KATCo        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23 27 43 42
Operating Segments | Stand-Alone Transmission | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (2) 0 (2) 0
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues (14) (13) (27) (27)
Corporate/Other and Reconciling Adjustments | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1 3 4 5
Corporate/Other and Reconciling Adjustments | Eliminations and reconciling adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues $ (15) $ (16) $ (31) $ (32)
[1] Includes excise and gross receipts tax collections of $98 million and $92 million during the three months ended June 30, 2024 and 2023, respectively, and $213 million and $201 million during the six months ended June 30, 2024 and 2023, respectively.