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Revenue (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
company
MW
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
company
MW
Jun. 30, 2021
USD ($)
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,806 $ 2,610 $ 5,776 $ 5,353
Total revenues [1] 2,818 2,622 5,807 5,348
Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Late payment charges 9 9 19 18
Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,188 1,278 2,508 2,591
Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 982 818 2,059 1,741
Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 167 77 263 150
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 440 411 891 812
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 29 26 55 59
ARP        
Disaggregation of Revenue [Line Items]        
Total revenues       (27)
Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 12 12 31 22
Derivative revenue | Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Late payment charges 2 2 11 2
Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,215 2,135 $ 4,657 4,409
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 from contracts with customers $ 1,310 1,287 $ 2,852 2,744
Regulated Distribution | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 575 562 1,172 1,103
Regulated Distribution | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 312 268 595 526
Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 18 18 38 36
Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 440 411 891 812
Regulated Transmission | ATSI        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 217 193 434 398
Regulated Transmission | TrAIL        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 64 57 127 117
Regulated Transmission | MAIT        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 77 80 156 147
Regulated Transmission | JCP&L        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 46 46 106 85
Regulated Transmission | MP, PE and WP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 36 35 68 65
Operating Segments | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,403 2,235 4,961 4,611
Total revenues 2,426 2,258 5,015 4,628
Operating Segments | Regulated Distribution | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,216 1,304 2,564 2,643
Operating Segments | Regulated Distribution | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 999 831 2,093 1,766
Operating Segments | Regulated Distribution | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 159 74 249 143
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 29 26 55 59
Operating Segments | Regulated Distribution | ARP        
Disaggregation of Revenue [Line Items]        
Total revenues       (27)
Operating Segments | Regulated Distribution | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 23 23 54 44
Operating Segments | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 440 411 891 812
Total revenues 441 419 894 824
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 440 411 891 812
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      
Operating Segments | Regulated Transmission | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 1 8 3 12
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (37) (36) (76) (70)
Total revenues (49) (55) (102) (104)
Corporate/Other and Reconciling Adjustments | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (28) (26) (56) (52)
Corporate/Other and Reconciling Adjustments | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (17) (13) (34) (25)
Corporate/Other and Reconciling Adjustments | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 8 3 14 7
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
Corporate/Other and Reconciling Adjustments | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues $ (12) $ (19) $ (26) $ (34)
[1] Includes excise and gross receipts tax collections of $91 million and $85 million during the three months ended June 30, 2022 and 2021, respectively, and $194 million and $180 million during the six months ended June 30, 2022 and 2021, respectively.