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Organization and Basis of Presentation (Details)
customer in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
transmission_center
company
MW
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
transmission_center
customer
company
mi
MW
Jun. 30, 2019
USD ($)
Property, Plant and Equipment [Line Items]        
Length of transmission lines | mi     24,500  
Number of regional transmission centers | transmission_center 2   2  
Capitalized cost of equity $ 12,000,000 $ 9,000,000 $ 23,000,000 $ 22,000,000
Capitalized interest 6,000,000 $ 7,000,000 13,000,000 $ 12,000,000
Incremental increase to uncollectible expense due to Covid-19 43,000,000      
Revolving Credit Facility | Line of Credit        
Property, Plant and Equipment [Line Items]        
Maximum amount borrowed under revolving credit facility 3,500,000,000   $ 3,500,000,000  
Ohio Companies and JCP&L | Future Recovery of Incremental Costs        
Property, Plant and Equipment [Line Items]        
Incremental increase to uncollectible expense due to Covid-19 $ 27,000,000      
Regulated Distribution        
Property, Plant and Equipment [Line Items]        
Number of existing utility operating companies | company 10   10  
Number of customers served by utility operating companies | customer     6  
Plant capacity (in MW's) | MW 3,790   3,790  
Regulated Distribution | Yard Creek Generating Plant        
Property, Plant and Equipment [Line Items]        
Plant capacity (in MW's) | MW 210   210