XML 71 R59.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Derivative Instruments (Details 4) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Outstanding net asset (liability) [Roll Forward] |  |  |  |
Outstanding net asset (liability), Beginning Balance | $ (137) | $ (147) | $ (135) | $ (140)
Unrealized gain (loss) |  | (8) | (12) | (15)
Purchases | 4 | 12 | 4 | 12
Settlements | 13 | 15 | 23 | 15
Outstanding net asset (liability), Ending Balance | (120) | (128) | (120) | (128)
NUGs |  |  |  |
Outstanding net asset (liability) [Roll Forward] |  |  |  |
Outstanding net asset (liability), Beginning Balance | (135) | (148) | (136) | (151)
Unrealized gain (loss) |  | (8) | (12) | (16)
Purchases | 0 | 0 | 0 | 0
Settlements | 11 | 16 | 24 | 27
Outstanding net asset (liability), Ending Balance | (124) | (140) | (124) | (140)
Regulated FTRs |  |  |  |
Outstanding net asset (liability) [Roll Forward] |  |  |  |
Outstanding net asset (liability), Beginning Balance | (2) | 1 | 1 | 11
Unrealized gain (loss) |  | 0 | 0 | 1
Purchases | 4 | 12 | 4 | 12
Settlements | 2 | (1) | (1) | (12)
Outstanding net asset (liability), Ending Balance | $ 4 | $ 12 | $ 4 | $ 12

X
- Definition Derivative instruments not designated as hedging instruments purchases + References No definition available. + Details
Name: | fe_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsPurchases
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settled Contracts. + References No definition available. + Details
Name: | fe_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsSettledContracts
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Derivative instruments not designated as hedging instruments unrealized gain (loss). + References No definition available. + Details
Name: | fe_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsUnrealizedGainLoss
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Derivatives not designated as hedging instruments at fair value net. + References No definition available. + Details
Name: | fe_DerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Outstanding Net Asset (Liability) [Roll Forward] + References No definition available. + Details
Name: | fe_OutstandingNetAssetLiabilityRollForward
Namespace Prefix: | fe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fe_NugsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fe_RegulatedFtrsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |