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Capitalization (Details Textuals) |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2017 $ / shares | Dec. 13, 2016 USD ($) shares | Dec. 06, 2016 USD ($) | Oct. 17, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 15, 2016 USD ($) | Aug. 15, 2016 USD ($) | Jul. 01, 2016 USD ($) | Jun. 01, 2016 USD ($) | May 01, 2016 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 $ / shares | Jun. 30, 2015 $ / shares | Mar. 31, 2015 $ / shares | Dec. 31, 2016 USD ($) subsidiary $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 $ / shares shares | Dec. 15, 2016 USD ($) | Dec. 05, 2016 USD ($) | Sep. 23, 2016 USD ($) | Jun. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  |  |  |  | $ (4,532,000,000) |  |  |  | $ 2,256,000,000 |  |  |  | $ (4,532,000,000) | $ 2,256,000,000 |  |  |  |  |
Dividends declared, in dollars per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.44 | $ 1.44 | $ 1.44 |  |  |  |
Common stock dividends per share paid, in dollars per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 |  |  |  |  |  |  |
FERC-defined equity to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |
Preferred shares shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |
Preference shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |
Number of subsidiaries that issued environmental control bonds | subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Environmental control bonds outstanding |  |  |  |  |  |  |  |  |  |  | $ 406,000,000 |  |  |  | $ 429,000,000 |  |  |  | $ 406,000,000 | $ 429,000,000 |  |  |  |  |
Transition bond outstanding |  |  |  |  |  |  |  |  |  |  | 85,000,000 |  |  |  | 128,000,000 |  |  |  | 85,000,000 | 128,000,000 |  |  |  |  |
Principal default amount specified in debt covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |
Currently payable long-term debt |  |  |  |  |  |  |  |  |  |  | 1,685,000,000 |  |  |  | 1,166,000,000 |  |  |  | 1,685,000,000 | 1,166,000,000 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared, in dollars per share | $ / shares | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  |  |  |  |  |  |  |  | 339,000,000 |  |  |  | 362,000,000 |  |  |  | $ 339,000,000 | 362,000,000 |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  | $ 1,200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Term of revolving credit facility |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FERC-defined equity to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |
FES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  |  |  |  | (3,509,000,000) |  |  |  | 1,946,000,000 |  |  |  | $ (3,509,000,000) | 1,946,000,000 |  |  |  |  |
Currently payable long-term debt |  |  |  |  |  |  |  |  |  |  | 179,000,000 |  |  |  | $ 512,000,000 |  |  |  | 179,000,000 | $ 512,000,000 |  |  |  |  |
FG | Loans Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  | $ 12,000,000 | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FG | Loans Payable | Fixed Rate PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  | $ 86,000,000 |  |  |  |  |  |  |  | 86,000,000 |  |  |  |  |  |
FG | Loans Payable | Variable Rate PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |
FG | PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  | $ 60,000,000 | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FG | PCRB | Fixed Rate PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FG | Line of Credit | Variable Rate PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of LOC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,000,000 |  |  |  |  |  |
NG | PCRB | 4.375% Fixed PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  | $ 285,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | Senior Notes | 5.625% Senior Unsecured Notes Due May 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Senior notes |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WP | FMBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  | $ 145,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 5.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
WP | FMBs | $475M Million First Mortgage Bonds 3.84% Due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.84% |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 475,000,000 |
WP | FMBs | $100M FMBs 3.84% Due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.84% |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
WP | FMBs | $100M FMBs 4.09% Due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.09% |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
WP | FMBs | $275M FMBs 4.14% Due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.14% |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |
WP | FMBs | $275M FMBs 5.95% Due December 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 5.95% |  |  |  |  |  |  |  | 5.95% |  |  |  |  |  |
PE | FMBs | $155 M FMBs, 3.89% Due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  | 3.89% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  | $ 155,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PE | FMBs | $100M FMBs 5.80% Due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  | 5.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Funding Companies | Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 445,000,000
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance - employee benefits, Shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,685,946 | 2,457,827 | 2,474,011 |  |  |  |
Minimum | FMBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 3.34% |  |  |  |  |  |  |  | 3.34% |  |  |  |  |  |
Minimum | FG | PCRB | Fixed Rate PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  | $ 86,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | FMBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 9.74% |  |  |  |  |  |  |  | 9.74% |  |  |  |  |  |
Maximum | FG | PCRB | Fixed Rate PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance - employee benefits, Shares | shares |  | 16,097,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Investment Plan and certain share-based benefit plans |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Parent and Certain Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of revolving credit facility |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Minimum Equity To Total Capitalization Ratio To Be Maintained For Payment Of Capital Dividend + References No definition available. + Details
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- Definition Number Of Subsidiaries That Issued Environmental Control Bonds + References No definition available. + Details
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- Definition Preference Stock Shares Outstanding. + References No definition available. + Details
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Balance Type: | na
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- Definition Principal Default Amount Specified In Debt Covenants. + References No definition available. + Details
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Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
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