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Revenue (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
company
MW
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
company
MW
Sep. 30, 2019
USD ($)
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,983 $ 2,926 $ 8,105 $ 8,180
Total revenues 3,022 [1] 2,963 [1] 8,253 8,362
Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Late payment charges 6 9 22 29
Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,481 1,436 3,935 3,840
Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 989 975 2,689 2,811
Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 70 102 194 325
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 408 371 1,185 1,090
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 35 42 102 114
Derivative Revenue | Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 8 2 14 7
ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 25 25 108 142
Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 14 12 40 40
Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues $ 2,508 2,446 6,735 6,756
Reduction in revenue     $ 2 31
Number of existing utility operating companies | company 10   10  
Megawatts of net demonstrated capacity of competitive segment | MW 3,790   3,790  
Utility customer payment period     30 days  
Regulated Distribution | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues $ 1,621 1,538 $ 4,220 4,145
Regulated Distribution | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues 589 600 1,640 1,759
Regulated Distribution | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues 278 286 814 786
Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 20 22 61 66
Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues 408 371 1,185 1,090
Reduction in revenue 3   6 11
Regulated Transmission | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 34 34 100 99
Regulated Transmission | ATSI        
Disaggregation of Revenue [Line Items]        
Total revenues 202 184 598 542
Regulated Transmission | TrAIL        
Disaggregation of Revenue [Line Items]        
Total revenues 61 55 182 172
Regulated Transmission | MAIT        
Disaggregation of Revenue [Line Items]        
Total revenues 68 58 183 157
Regulated Transmission | JCP&L        
Disaggregation of Revenue [Line Items]        
Total revenues 43 40 122 120
Operating Segments | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,610 2,588 7,025 7,185
Total revenues 2,661 2,636 7,207 7,401
Reduction in revenue 1 4    
Operating Segments | Regulated Distribution | Distribution Modernization Rider        
Disaggregation of Revenue [Line Items]        
Reduction in revenue   31    
Operating Segments | Regulated Distribution | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,503 1,457 4,000 3,903
Operating Segments | Regulated Distribution | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,005 989 2,735 2,853
Operating Segments | Regulated Distribution | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 67 100 188 316
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 35 42 102 113
Operating Segments | Regulated Distribution | ARP        
Disaggregation of Revenue [Line Items]        
Total revenues 25 25 108 142
Operating Segments | Regulated Distribution | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 26 23 74 74
Operating Segments | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 408 371 1,185 1,090
Total revenues 413 375 1,198 1,103
Reduction in revenue   4    
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 408 371 1,185 1,090
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 5 4 13 13
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (35) (33) (105) (95)
Total revenues (52) (48) (152) (142)
Corporate/Other and Reconciling Adjustments | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (22) (21) (65) (63)
Corporate/Other and Reconciling Adjustments | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (16) (14) (46) (42)
Corporate/Other and Reconciling Adjustments | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3 2 6 9
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 1
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 $ (17) $ (15) $ (47) $ (47)
[1] Includes excise and gross receipts tax collections of $100 million during each of the three months ended September 30, 2020 and 2019, and $276 million and $283 million during the nine months ended September 30, 2020 and 2019, respectively.