XML 128 R105.htm IDEA: XBRL DOCUMENT v3.10.0.1

Regulatory Matters - Distribution Rate Orders (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2018
CEI
Public Utilities, General Disclosures [Line Items]
Allowed Debt		51.00%
Allowed Equity		49.00%
Approved ROE		10.50%
ME
Public Utilities, General Disclosures [Line Items]
Allowed Debt		48.80%
Allowed Equity		51.20%
MP
Public Utilities, General Disclosures [Line Items]
Allowed Debt		54.00%
Allowed Equity		46.00%
JCP&L
Public Utilities, General Disclosures [Line Items]
Allowed Debt		55.00%
Allowed Equity		45.00%
Approved ROE		9.60%
OE
Public Utilities, General Disclosures [Line Items]
Allowed Debt		51.00%
Allowed Equity		49.00%
Approved ROE		10.50%
PN
Public Utilities, General Disclosures [Line Items]
Allowed Debt		47.40%
Allowed Equity		52.60%
Penn
Public Utilities, General Disclosures [Line Items]
Allowed Debt		49.90%
Allowed Equity		50.10%
Penn | West Virginia
Public Utilities, General Disclosures [Line Items]
Allowed Debt		54.00%
Allowed Equity		46.00%
Penn | Maryland
Public Utilities, General Disclosures [Line Items]
Allowed Debt		48.00%
Allowed Equity		52.00%
Approved ROE		11.90%
TE
Public Utilities, General Disclosures [Line Items]
Allowed Debt		51.00%
Allowed Equity		49.00%
Approved ROE		10.50%
WP
Public Utilities, General Disclosures [Line Items]
Allowed Debt		49.70%
Allowed Equity		50.30%
ATSI | Regulated Transmission
Public Utilities, General Disclosures [Line Items]
Approved ROE		10.38%
MAIT | Regulated Transmission
Public Utilities, General Disclosures [Line Items]
Allowed Debt		50.00%
Allowed Equity		50.00%
Approved ROE		10.30%
TrAIL | Regulated Transmission | TrAIL the Line and Black Oak SVC
Public Utilities, General Disclosures [Line Items]
Approved ROE		12.70%
TrAIL | Regulated Transmission | All Other Projects
Public Utilities, General Disclosures [Line Items]
Approved ROE		11.70%
Subsequent Event | MAIT | Regulated Transmission
Public Utilities, General Disclosures [Line Items]
Allowed Debt	60.00%

X

- Definition

Percentage of public utility's approved debt to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedDebtCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of public utility's approved equity to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of public utility's approved return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=fe_CeiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_MetropolitanEdisonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_MonongahelaPowerCompanyMember
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_OeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_PennsylvaniaElectricCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_PennMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_WV
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_MD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_TheToledoEdisonCompanyMember
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:	dei_LegalEntityAxis=fe_AtsiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fe_RegulatedTransmissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_MidAtlanticInterstateTransmissionLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_TrailMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilityAxis=fe_TrAILtheLineandBlackOakSVCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilityAxis=fe_AllOtherProjectsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: