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Variable Interest Entities (Details Textuals)	12 Months Ended
	Dec. 31, 2018 USD ($) agreement entity	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2013 USD ($)
Variable Interest Entities (Textuals) [Abstract]
Transition bond outstanding	$ 41,000,000	$ 56,000,000
Environmental control bonds outstanding	$ 358,000,000	383,000,000
Number of contracts that may contain variable interest | entity	1
Purchased power	$ 3,109,000,000	2,926,000,000	$ 3,310,000,000
Power Purchase Agreements
Variable Interest Entities (Textuals) [Abstract]
Number of long-term power purchase agreements maintained by FirstEnergy with NUG entities | agreement	11
Path-WV
Variable Interest Entities (Textuals) [Abstract]
Equity method investments	$ 17,000,000
Percentage of high-voltage transmission line project owned by subsidiary of AE on the Allegheny Series	100.00%
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series	50.00%
FEV
Variable Interest Entities (Textuals) [Abstract]
Equity method investments	$ 7,000,000
Other FE subsidiaries
Variable Interest Entities (Textuals) [Abstract]
Ownership interest (percent)	0.00%
Other FE subsidiaries | Power Purchase Agreements
Variable Interest Entities (Textuals) [Abstract]
Purchased power	$ 108,000,000	112,000,000
Ohio Funding Companies
Variable Interest Entities (Textuals) [Abstract]
Aggregate annual servicing fees receivable for phase-in recovery bonds	$ 445,000
Global Holding | FEV | Signal Peak
Variable Interest Entities (Textuals) [Abstract]
Ownership interest (percent)	33.33%
Phase In Recovery Bonds
Variable Interest Entities (Textuals) [Abstract]
Long-term debt and other long-term obligations	$ 292,000,000	$ 315,000,000
Phase In Recovery Bonds | Ohio Funding Companies
Variable Interest Entities (Textuals) [Abstract]
Face amount of loan					$ 445,000,000
Senior Loans | Senior Secured Term Loan | Global Holding
Variable Interest Entities (Textuals) [Abstract]
Long-term debt and other long-term obligations	190,000,000
Term Loan Facility Due March 2020 | Line of Credit | Global Holding
Variable Interest Entities (Textuals) [Abstract]
Face amount of loan	$ 300,000,000			$ 300,000,000

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Number of long term power purchase agreements maintained by parent company with Non utility generation entities.

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Variable interest entities percentage of high voltage transmission line project owned By variable interest entity one in joint venture party one.

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Variable Interest Entities Percentage of high voltage transmission line project owned By variable interest entity one in joint venture party two.

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Variable Interest Entities.

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All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Represents the current and noncurrent portions of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer.

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Long-Term transition bonds are bonds under the Competition Act in which the proceeds of Transition Bonds are required to be used principally to reduce qualified stranded costs and the related capitalization of the utility. This represents the current and noncurrent portions. The initial maturity is beyond one year or beyond the normal operating cycle, if longer.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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