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Organization, Basis of Presentation and Significant Accounting Policies (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables from customers    
Customers $ 1,554us-gaap_AccountsReceivableNetCurrent $ 1,720us-gaap_AccountsReceivableNetCurrent
FES    
Receivables from customers    
Customers 415us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= fe_FesMember		 539us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= fe_FesMember
Billed    
Receivables from customers    
Customers 914us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember		 239us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember
Billed | FES    
Receivables from customers    
Customers 1,010us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember
/ dei_LegalEntityAxis
= fe_FesMember		 301us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember
/ dei_LegalEntityAxis
= fe_FesMember
Unbilled    
Receivables from customers    
Customers 640us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember		 176us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
Unbilled | FES    
Receivables from customers    
Customers $ 710us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
/ dei_LegalEntityAxis
= fe_FesMember		 $ 238us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
/ dei_LegalEntityAxis
= fe_FesMember