Derivative Instruments (Details Textuals) (USD $)	3 Months Ended										3 Months Ended		3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Commodity contracts	Mar. 31, 2014 NUGs	Mar. 31, 2014 FTRs	Mar. 31, 2014 FES Commodity contracts	Mar. 31, 2014 FES FTRs	Mar. 31, 2014 JCP&L contracts	Oct. 22, 2013 JCP&L appeal	Mar. 31, 2014 Cash Flow Hedges agreements	Dec. 31, 2013 Cash Flow Hedges agreements	Mar. 31, 2014 Fair Value Hedging agreements	Mar. 31, 2013 Fair Value Hedging	Dec. 31, 2013 Fair Value Hedging agreements	Mar. 31, 2013 Interest Rate Swap
Derivative [Line Items]
Unamortized gains or losses associated with designated cash flow hedges	$ 1,000,000		$ 2,000,000
Gain (loss) on cash flow hedge expected to be reclassified to earnings in next twelve months	9,000,000
Number of forward starting swap agreements accounted for as a cash flow hedge outstanding											0	0
Unamortized gains or losses associated with prior interest rate hedges	57,000,000		59,000,000
Losses to be amortized to interest expenses during next twelve months											(9,000,000)		11,000,000
Interest expense	265,000,000	258,000,000														(2,000,000)
Number of fixed-for-floating interest rate swap agreements outstanding													0		0
Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements	41,000,000		44,000,000
Reclassifications from long-term debt													3,000,000	6,000,000
Number of outstanding commodity or interest rate derivatives													0		0
Net asset position under commodity derivative contracts				117,000,000
Collateral posted							85,000,000	4,000,000
Additional collateral related to commodity derivatives							11,000,000
Possible adverse change in quoted market prices of derivative instruments	10.00%
Possible decrease net income due to ten percent adverse change in commodity prices	40,000,000
Liability position					185,000,000	1,000,000		3,000,000
Number of outstanding LCAPP contracts									2
Number of appeals dismissed										2
Period in which LSEs may request direct allocation of FTRs	2 years
Direct allocation of FTRs, cost	$ 0