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Revenue (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
company
MW
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
company
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 $ 10,805 $ 10,944  
ARP                 181 254  
Other                 49 63  
Total revenues $ 2,673 $ 2,963 $ 2,516 $ 2,883 $ 2,710 $ 3,064 $ 2,625 $ 2,862 $ 11,035 [1] 11,261 [1] $ 10,928 [1]
Utility customer payment period                 30 days    
Other Non-Customer Revenue                      
Disaggregation of Revenue [Line Items]                      
Late payment charges                 $ 37 39  
Distribution services                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 5,050 5,055  
Total revenues                 8,720 8,937 8,685
Retail generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 3,670 3,882  
Wholesale sales                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 423 524  
Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,510 1,335  
Total revenues                 1,510 1,335 1,307
Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 152 148  
Total revenues                 805 989 $ 936
Derivative Revenue | Other Non-Customer Revenue                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 8 18  
Regulated Distribution                      
Disaggregation of Revenue [Line Items]                      
Reduction in revenue                 $ 16 131  
Number of existing utility operating companies | company 10               10    
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW 3,790               3,790    
Regulated Distribution | Retail generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 $ 8,860 9,095  
Regulated Distribution | Retail generation | Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 5,412 5,598  
Regulated Distribution | Retail generation | Commercial                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 2,252 2,350  
Regulated Distribution | Retail generation | Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 1,106 1,056  
Regulated Distribution | Retail generation | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 90 91  
Regulated Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 1,510 1,335  
Reduction in revenue                 19 16  
Regulated Transmission | JCP&L | FERC                      
Disaggregation of Revenue [Line Items]                      
Annual revenue requirement                 155    
Regulated Transmission | ATSI                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 754 664  
Regulated Transmission | TrAIL                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 242 237  
Regulated Transmission | MAIT                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 224 150  
Regulated Transmission | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 290 284  
Operating Segments | Customer                      
Disaggregation of Revenue [Line Items]                      
Reduction in revenue                   147  
Operating Segments | Regulated Distribution                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 9,421 9,741  
ARP                 181 254  
Other                 96 108  
Total revenues                 9,698 10,103  
Operating Segments | Regulated Distribution | Distribution services                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 5,133 5,159  
Operating Segments | Regulated Distribution | Retail generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 3,727 3,936  
Operating Segments | Regulated Distribution | Wholesale sales                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 411 502  
Operating Segments | Regulated Distribution | Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Regulated Distribution | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 150 144  
Operating Segments | Regulated Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,510 1,335  
ARP                 0 0  
Other                 16 18  
Total revenues                 1,526 1,353  
Operating Segments | Regulated Transmission | Distribution services                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Regulated Transmission | Retail generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Regulated Transmission | Wholesale sales                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Operating Segments | Regulated Transmission | Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 1,510 1,335  
Operating Segments | Regulated Transmission | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate/Other and Reconciling Adjustments                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (126) (132)  
ARP                 0 0  
Other                 (63) (63)  
Total revenues                 (189) (195)  
Corporate/Other and Reconciling Adjustments | Distribution services                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (83) (104)  
Corporate/Other and Reconciling Adjustments | Retail generation                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 (57) (54)  
Corporate/Other and Reconciling Adjustments | Wholesale sales                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 12 22  
Corporate/Other and Reconciling Adjustments | Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 0 0  
Corporate/Other and Reconciling Adjustments | Other                      
Disaggregation of Revenue [Line Items]                      
Total revenues from contracts with customers                 $ 2 $ 4  
[1] Includes excise and gross receipts tax collections of $373 million, $386 million and $370 million in 2019, 2018 and 2017, respectively.