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

X

- 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

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: