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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total revenues [1] $ 3,475 $ 3,124 $ 9,282 $ 8,472
Operating Segments | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,999 2,735 7,960 7,346
Total revenues 3,023 2,759 8,038 7,387
Operating Segments | Regulated Distribution | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 159 117 408 260
Operating Segments | Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 27 30 82 89
Operating Segments | Regulated Distribution | ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 (27)
Operating Segments | Regulated Distribution | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 24 24 78 68
Operating Segments | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 502 411 1,393 1,223
Total revenues 503 415 1,397 1,233
Operating Segments | Regulated Transmission | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues 1 4 4 10
Operating Segments | Residential | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,756 1,666 4,608 4,410
Operating Segments | Commercial | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 686 619 1,858 1,722
Operating Segments | Industrial | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 348 284 943 810
Operating Segments | Other | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23 19 61 55
Operating Segments | ATSI | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 252 206 686 604
Operating Segments | TrAIL | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 78 59 205 176
Operating Segments | MAIT | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 97 75 253 222
Operating Segments | JCP&L | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 45 41 151 126
Operating Segments | MP, PE and WP | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 30 30 98 95
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues (51) (50) (153) (148)
Corporate/Other and Reconciling Adjustments | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7 5 21 12
Corporate/Other and Reconciling Adjustments | Retail Generation and Distribution Services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (46) (38) (136) (115)
Corporate/Other and Reconciling Adjustments | Other revenue unrelated to contracts with customers        
Disaggregation of Revenue [Line Items]        
Total revenues $ (12) $ (17) $ (38) $ (45)
[1] Includes excise and gross receipts tax collections of $111 million and $103 million during the three months ended September 30, 2022 and 2021, respectively, and $305 million and $283 million during the nine months ended September 30, 2022 and 2021, respectively.