XML 132 R113.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Capitalization (Details) | Dec. 31, 2017 $ / shares shares
--- | ---
Preferred stock and preference stock authorizations |
Shares Authorized | 5,000,000
Par Value, in dollars per share | $ / shares | $ 100
Penn |
Preferred stock and preference stock authorizations |
Shares Authorized | 1,200,000
Par Value, in dollars per share | $ / shares | $ 100
CEI |
Preferred stock and preference stock authorizations |
Shares Authorized | 4,000,000
JCP&L |
Preferred stock and preference stock authorizations |
Shares Authorized | 15,600,000
ME |
Preferred stock and preference stock authorizations |
Shares Authorized | 10,000,000
PN |
Preferred stock and preference stock authorizations |
Shares Authorized | 11,435,000
PE |
Preferred stock and preference stock authorizations |
Shares Authorized | 10,000,000
Par Value, in dollars per share | $ / shares | $ 0.01
WP |
Preferred stock and preference stock authorizations |
Shares Authorized | 32,000,000
Preferred Stock With Par Value $100 | OE |
Preferred stock and preference stock authorizations |
Shares Authorized | 6,000,000
Par Value, in dollars per share | $ / shares | $ 100
Preferred Stock With Par Value $100 | TE |
Preferred stock and preference stock authorizations |
Shares Authorized | 3,000,000
Par Value, in dollars per share | $ / shares | $ 100
Preferred Stock With Par Value $100 | MP |
Preferred stock and preference stock authorizations |
Shares Authorized | 940,000
Par Value, in dollars per share | $ / shares | $ 100
Preferred Stock With Par Value $25 | OE |
Preferred stock and preference stock authorizations |
Shares Authorized | 8,000,000
Par Value, in dollars per share | $ / shares | $ 25
Preferred Stock With Par Value $25 | TE |
Preferred stock and preference stock authorizations |
Shares Authorized | 12,000,000
Par Value, in dollars per share | $ / shares | $ 25
Preference Stock | OE |
Preferred stock and preference stock authorizations |
Preference Stock Shares Authorized | 8,000,000
Preference Stock | CEI |
Preferred stock and preference stock authorizations |
Preference Stock Shares Authorized | 3,000,000
Preference Stock | TE |
Preferred stock and preference stock authorizations |
Preference Stock Shares Authorized | 5,000,000
Preference Stock Par Value, in dollars per share | $ / shares | $ 25

X
- Definition Preference stock par or stated value per share. + References No definition available. + Details
Name: | fe_PreferenceStockParOrStatedValuePerShare
Namespace Prefix: | fe_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preference stock shares authorized. + References No definition available. + Details
Name: | fe_PreferenceStockSharesAuthorized
Namespace Prefix: | fe_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred stock and preference stock number of shares authorized and par value disclosures. + References No definition available. + Details
Name: | fe_PreferredStockAndPreferenceStockNumberOfSharesAuthorizedAndParValueDisclosuresAbstract
Namespace Prefix: | fe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=fe_PennMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_CeiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_JcpAndLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_MetEdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_PenelecMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_PeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_WpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=fe_PreferredStockWithParValue100Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_OeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_TeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_MPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=fe_PreferredStockWithParValue25Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=fe_PreferenceStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |