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Revenue (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
company
MW
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
company
MW
Jun. 30, 2020
USD ($)
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,610 $ 2,493 $ 5,353 $ 5,122
Total revenues [1] 2,622 2,522 5,348 5,231
Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Late payment charges 9 6 18 16
Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,278 1,219 2,591 2,454
Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 818 811 1,741 1,700
Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 77 52 150 124
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 411 380 812 777
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 26 31 59 67
ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 0 15 (27) 83
Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 12 14 22 26
Derivative revenue | Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Late payment charges 2 6 2 6
Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues $ 2,135 2,067 $ 4,409 4,227
Number of existing utility operating companies | company 10   10  
Megawatts of net demonstrated capacity of competitive segment | MW 3,580   3,580  
Utility customer payment period     30 days  
Regulated Distribution | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues $ 1,287 1,280 $ 2,744 2,599
Regulated Distribution | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues 562 507 1,103 1,051
Regulated Distribution | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues 268 259 526 536
Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 18 21 36 41
Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues 411 380 812 777
Regulated Transmission | ATSI        
Disaggregation of Revenue [Line Items]        
Total revenues 193 192 398 394
Regulated Transmission | TrAIL        
Disaggregation of Revenue [Line Items]        
Total revenues 57 57 117 121
Regulated Transmission | MAIT        
Disaggregation of Revenue [Line Items]        
Total revenues 80 58 147 117
Regulated Transmission | JCP&L        
Disaggregation of Revenue [Line Items]        
Total revenues 46 39 85 77
Regulated Transmission | MP, PE and WP        
Disaggregation of Revenue [Line Items]        
Total revenues 35 34 65 68
Operating Segments | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,235 2,148 4,611 4,415
Total revenues 2,258 2,188 4,628 4,546
Operating Segments | Regulated Distribution | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,304 1,241 2,643 2,497
Operating Segments | Regulated Distribution | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 831 826 1,766 1,730
Operating Segments | Regulated Distribution | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 74 50 143 121
Operating Segments | Regulated Distribution | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 26 31 59 67
Operating Segments | Regulated Distribution | ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 0 15 (27) 83
Operating Segments | Regulated Distribution | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 23 25 44 48
Operating Segments | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 411 380 812 777
Total revenues 419 384 824 785
Operating Segments | Regulated Transmission | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 411 380 812 777
Operating Segments | Regulated Transmission | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Regulated Transmission | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 8 4 12 8
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (36) (35) (70) (70)
Total revenues (55) (50) (104) (100)
Corporate/Other and Reconciling Adjustments | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (26) (22) (52) (43)
Corporate/Other and Reconciling Adjustments | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (13) (15) (25) (30)
Corporate/Other and Reconciling Adjustments | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3 2 7 3
Corporate/Other and Reconciling Adjustments | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate/Other and Reconciling Adjustments | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate/Other and Reconciling Adjustments | ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate/Other and Reconciling Adjustments | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues $ (19) $ (15) $ (34) $ (30)
[1] Includes excise and gross receipts tax collections of $85 million and $84 million during the three months ended June 30, 2021 and 2020, respectively, and $180 million and $176 million during the six months ended June 30, 2021 and 2020, respectively.