XML 117 R75.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Taxes (Details 3) $ in Millions | Dec. 31, 2019 USD ($)
--- | ---
State |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | $ 5,714
State | 2020-2024 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 1,844
State | 2025-2029 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 1,652
State | 2030-2034 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 1,265
State | 2035-2039 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 886
State | Indefinite |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 67
Local |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 1,081
Local | 2020-2024 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 1,081
Local | 2025-2029 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 0
Local | 2030-2034 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 0
Local | 2035-2039 |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | 0
Local | Indefinite |
Pre-tax net operating loss expiration period |
Pre-tax net operating loss carryforwards for state and local income tax purposes | $ 0

X
- References No definition available. + Details
Name: | us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsComponentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=fe_StateJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_ExpirationPeriodAxis=fe_PeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_ExpirationPeriodAxis=fe_PeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_ExpirationPeriodAxis=fe_PeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_ExpirationPeriodAxis=fe_PeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fe_ExpirationPeriodAxis=fe_IndefiniteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=fe_LocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |