Short-Term Borrowings and Bank Lines of Credit (Details Textuals) (USD $)							0 Months Ended			0 Months Ended				0 Months Ended			0 Months Ended														12 Months Ended			12 Months Ended									12 Months Ended
	Jan. 31, 2014	Dec. 31, 2013 money_pool	Dec. 31, 2012	Dec. 31, 2013 Amended Term Loan [Member]	Dec. 31, 2013 Term Loan	Nov. 30, 2013 Term Loan	Oct. 31, 2013 Revolving Credit Facility	May 08, 2013 Revolving Credit Facility credit_facility	Mar. 31, 2013 FE Senior Notes	May 08, 2013 FE Revolving Credit Facility	Dec. 31, 2013 FES		Dec. 31, 2012 FES	May 08, 2013 FES Revolving Credit Facility	Dec. 31, 2013 JCP&L		May 08, 2013 JCP&L Revolving Credit Facility	Dec. 31, 2013 FirstEnergy		Dec. 31, 2013 FET		Dec. 31, 2013 PN		Dec. 31, 2013 PN Senior Notes Senior Notes, 5.13% Due 2014	Dec. 31, 2013 ME		Dec. 31, 2013 ME Senior Notes Senior Notes, 4.88% Due 2014	Mar. 31, 2013 FES Corp and Allegheny Energy Inc Senior Notes Minimum	Mar. 31, 2013 FES Corp and Allegheny Energy Inc Senior Notes Maximum	Oct. 31, 2013 FES Corp and Allegheny Energy Inc Revolving Credit Facility	Dec. 31, 2012 Revolving Credit Facility extension	Dec. 31, 2013 Revolving Credit Facility Minimum	Jan. 31, 2014 Revolving Credit Facility FES / AE Supply	Dec. 31, 2013 Revolving Credit Facility Parent and Certain Subsidiaries credit_facility	Jan. 31, 2014 Revolving Credit Facility FirstEnergy		Jan. 31, 2014 Revolving Credit Facility FET		Dec. 31, 2013 Available for Issuance of Letters of Credit	Dec. 31, 2013 Available for Issuance of Letters of Credit Minimum	Dec. 31, 2013 Available for Issuance of Letters of Credit FET	Dec. 31, 2013 Available for Issuance of Letters of Credit FET Minimum	Dec. 31, 2013 Money Pool Maximum	Dec. 31, 2013 Money Pool Unregulated Companies	Dec. 31, 2013 Money Pool Regulated Companies
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]
Short-term borrowings		$ 3,404,000,000	$ 1,969,000,000								$ 4,000,000		$ 4,000,000
Number of credit facilities																																		3
Term of credit facility																																		5 years
Maximum amount borrowed under revolving credit facility	6,000,000,000										1,500,000,000	[1]			600,000,000	[2]		2,500,000,000	[3]	1,000,000,000	[3]	300,000,000	[2]		300,000,000	[2]							2,500,000,000	6,000,000,000	2,500,000,000	[4]	1,000,000,000	[5]
Number of credit facilities extended								3
Number of extension periods																															1
Term of extension period										1 year				1 year			1 year														1 year
Term of revolving credit facility, in days																																364 days											364 days
Increase in borrowing capacity										500,000,000				500,000,000			175,000,000
Amount of revolving line of credit							2,500,000,000.0			2,500,000,000				2,500,000,000			600,000,000													2,500,000,000.0									700,000,000		225,000,000
Line of Credit Facility, Amounts Excluded From Debt to Capital Ratio Calculation							1,400,000,000																							785,700,000
Line of Credit Facility, Increase, Amounts Excluded From Debt to Capital Ratio Calculation							1,400,000,000
Cross-default provision for other indebtedness																																								100,000,000		100
Face amount of loan				150,000,000	200,000,000	150,000,000			1,500,000,000
Amount of debt redeemed																								$ 150,000,000			$ 100,000,000
Interest Rate																								5.13%			4.88%	5.75%	6.80%
Number of money pools		2
Average interest rate for borrowings		1.80%	1.97%																																									1.34%	0.67%

[1] (2)No limitation based upon blanket financing authorization from the FERC under existing market-based rate tariffs.

[2] (3)Excluding amounts which may be borrowed under the regulated companies' money pool.

[3] (1)No limitations.

[4] (1)FE and the Utilities

[5] (2)Includes FET, ATSI and TrAIL as subsidiary borrowers