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Variable Interest Entities (Details Textuals) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) agreement entity | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Long-term transition bond |  | $ 60,000,000 |  | $ 60,000,000 |  | $ 85,000,000
Long-term pollution control bond |  | 383,000,000 |  | 383,000,000 |  | 406,000,000
Guarantor obligations |  | 412,000,000 |  | $ 412,000,000 |  |
Number of contracts that may contain variable interest | entity |  |  |  | 1 |  |
Purchased power |  | $ 861,000,000 | $ 979,000,000 | $ 2,459,000,000 | $ 2,992,000,000 |
Bruce Mansfield Unit 1 |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Percentage of undivided interest of non guarantor subsidiary |  | 93.83% |  | 93.83% |  |
Power Purchase Agreements |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Ownership interest |  | 0.00% |  | 0.00% |  |
Number of long-term power purchase agreements maintained by FirstEnergy with NUG entities | agreement |  |  |  | 12 |  |
Phase In Recovery Bonds |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Long-term debt and other long-term obligations |  | $ 315,000,000 |  | $ 315,000,000 |  | $ 339,000,000
Ohio Funding Companies |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Annual servicing fees |  |  |  | 445,000 |  |
Other FE subsidiaries | Power Purchase Agreements |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Purchased power |  | $ 29,000,000 | $ 22,000,000 | $ 82,000,000 | $ 78,000,000 |
NG | Beaver Valley Unit 2 |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Increase in plant ownership percentage (percent) | 2.60% |  |  |  |  |
Purchase of remaining non-affiliated leasehold interest | $ 38,000,000 |  |  |  |  |
Path-WV |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Percentage of high-voltage transmission line project owned by subsidiary of FE on the Allegheny Series |  | 100.00% |  | 100.00% |  |
Percentage of high-voltage transmission line project owned by subsidiary of FE on the West Virginia Series |  | 50.00% |  | 50.00% |  |
Global Holding | Guarantee of senior secured loan facility |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Guarantor obligations |  | $ 300,000,000 |  | $ 300,000,000 |  |
Signal Peak | Global Holding | FEV |  |  |  |  |  |
Variable Interest Entities (Textuals) [Abstract] |  |  |  |  |  |
Ownership interest |  | 33.33% |  | 33.33% |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746 + Details
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- Definition Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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