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Short-Term Borrowings and Bank Lines of Credit (Details 1) - USD ($)	Feb. 18, 2019	Jan. 31, 2019	Oct. 19, 2018
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
FE | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits			$ 3,500,000,000
Subsequent Event
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits	$ 3,500,000,000
Subsequent Event | FET
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		$ 0
Subsequent Event | OE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		500,000,000
Subsequent Event | CEI
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		500,000,000
Subsequent Event | TE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		300,000,000
Subsequent Event | JCP&L
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		500,000,000
Subsequent Event | ME
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		500,000,000
Subsequent Event | PN
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		300,000,000
Subsequent Event | WP
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		200,000,000
Subsequent Event | MP
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		500,000,000
Subsequent Event | PE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		150,000,000
Subsequent Event | ATSI
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		500,000,000
Subsequent Event | Penn
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		100,000,000
Subsequent Event | TrAIL
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		400,000,000
Subsequent Event | MAIT
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		400,000,000
Subsequent Event | FE
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Regulatory and Other Short-Term Debt Limitations		0
Subsequent Event | FE | Line of Credit | Revolving Credit Facility
Borrowing sub-limits for each borrower and limitations on short-term indebtedness
Revolving Credit Facility Sub-Limits		2,500,000,000
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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		500,000,000
Subsequent Event | 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		500,000,000
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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		100,000,000
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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
Subsequent Event | 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

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Regulatory and other Short-term debt limitations.

+ References

No definition available.

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

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