XML 138 R119.htm IDEA: XBRL DOCUMENT v3.8.0.1

Short-Term Borrowings and Bank Lines of Credit (Details 1) - Subsequent Event	Jan. 31, 2018 USD ($)
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	$ 5,000,000,000
FET
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	0
OE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	500,000,000
CEI
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	500,000,000
TE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	300,000,000
JCP&L
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	500,000,000
ME
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	500,000,000
PN
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	300,000,000
WP
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	200,000,000
MP
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	500,000,000
PE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	150,000,000
ATSI
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	500,000,000
Penn
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	100,000,000
TrAIL
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	400,000,000
MAIT
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	400,000,000
FE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations	0
FE | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	4,000,000,000
FE | FET | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	0
FE | OE | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	500,000,000
FE | CEI | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	500,000,000
FE | TE | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	300,000,000
FE | JCP&L | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	600,000,000
FE | ME | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	300,000,000
FE | PN | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	300,000,000
FE | WP | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	200,000,000
FE | MP | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	500,000,000
FE | PE | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	150,000,000
FE | ATSI | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	0
FE | Penn | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	50,000,000
FE | TrAIL | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	0
FE | MAIT | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	0
FET Sub-limits | FET | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	1,000,000,000
FET Sub-limits | ATSI | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	500,000,000
FET Sub-limits | TrAIL | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	400,000,000
FET Sub-limits | MAIT | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	$ 400,000,000

X

- Definition

Regulatory and other Short-term debt limitations.

+ References

No definition available.

+ Details

Name:	fe_RegulatoryAndOtherShortTermDebtLimitations
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	dei_LegalEntityAxis=fe_FetMember
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_CeiMember
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_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_WestPennMember
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:	dei_LegalEntityAxis=fe_PeMember
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:	dei_LegalEntityAxis=fe_PennMember
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:	dei_LegalEntityAxis=fe_MidAtlanticInterstateTransmissionLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: