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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.