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v3.20.4

Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Millions | Jan. 31, 2018 USD ($)
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OPIC |
Amount of beneficial conversion | $ 296

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- Definition Non-cash Transaction, Beneficial Conversion + References No definition available. + Details
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Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |