XML 55 R44.htm IDEA: XBRL DOCUMENT v3.8.0.1

Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Assets
Fair value, assets	$ 3,355	$ 3,197
Liabilities
Fair value, liabilities	(106)	(238)
Net assets (liabilities)	3,249	2,959
FES
Assets
Fair value, assets	1,869	1,766
Liabilities
Fair value, liabilities	(13)	(129)
Net assets (liabilities)	1,856	1,637
Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(12)	(124)
Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(12)	(124)
FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(2)	(6)
FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(1)	(5)
NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(92)	(108)
Corporate debt securities
Assets
Fair value, assets	1,201	1,247
Corporate debt securities | FES
Assets
Fair value, assets	722	726
Commodity contracts | Derivative Assets
Assets
Fair value, assets	35	210
Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	35	210
FTRs | Derivative Assets
Assets
Fair value, assets	5	7
FTRs | Derivative Assets | FES
Assets
Fair value, assets	1	4
NUG contracts | Derivative Assets
Assets
Fair value, assets	0	1
Equity securities
Assets
Fair value, assets	1,045	925
Equity securities | FES
Assets
Fair value, assets	765	634
Foreign government debt securities
Assets
Fair value, assets	92	78
Foreign government debt securities | FES
Assets
Fair value, assets	65	58
U.S. government debt securities
Assets
Fair value, assets	152	161
U.S. government debt securities | FES
Assets
Fair value, assets	138	48
U.S. state debt securities
Assets
Fair value, assets	274	246
U.S. state debt securities | FES
Assets
Fair value, assets	21	3
Other
Assets
Fair value, assets	551	322
Other | FES
Assets
Fair value, assets	122	83
Level 1
Assets
Fair value, assets	1,444	1,134
Liabilities
Fair value, liabilities	0	(6)
Net assets (liabilities)	1,444	1,128
Level 1 | FES
Assets
Fair value, assets	767	646
Liabilities
Fair value, liabilities	0	(6)
Net assets (liabilities)	767	640
Level 1 | Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	(6)
Level 1 | Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	(6)
Level 1 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 1 | FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 1 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 1 | Corporate debt securities
Assets
Fair value, assets	0	0
Level 1 | Corporate debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | Commodity contracts | Derivative Assets
Assets
Fair value, assets	0	10
Level 1 | Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	0	10
Level 1 | FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Level 1 | FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 1 | NUG contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 1 | Equity securities
Assets
Fair value, assets	1,045	925
Level 1 | Equity securities | FES
Assets
Fair value, assets	765	634
Level 1 | Foreign government debt securities
Assets
Fair value, assets	0	0
Level 1 | Foreign government debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | U.S. government debt securities
Assets
Fair value, assets	0	0
Level 1 | U.S. government debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | U.S. state debt securities
Assets
Fair value, assets	0	0
Level 1 | U.S. state debt securities | FES
Assets
Fair value, assets	0	0
Level 1 | Other
Assets
Fair value, assets	399	199
Level 1 | Other | FES
Assets
Fair value, assets	2	2
Level 2
Assets
Fair value, assets	1,906	2,055
Liabilities
Fair value, liabilities	(12)	(118)
Net assets (liabilities)	1,894	1,937
Level 2 | FES
Assets
Fair value, assets	1,101	1,116
Liabilities
Fair value, liabilities	(12)	(118)
Net assets (liabilities)	1,089	998
Level 2 | Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(12)	(118)
Level 2 | Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(12)	(118)
Level 2 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 2 | FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 2 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 2 | Corporate debt securities
Assets
Fair value, assets	1,201	1,247
Level 2 | Corporate debt securities | FES
Assets
Fair value, assets	722	726
Level 2 | Commodity contracts | Derivative Assets
Assets
Fair value, assets	35	200
Level 2 | Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	35	200
Level 2 | FTRs | Derivative Assets
Assets
Fair value, assets	0	0
Level 2 | FTRs | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 2 | NUG contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 2 | Equity securities
Assets
Fair value, assets	0	0
Level 2 | Equity securities | FES
Assets
Fair value, assets	0	0
Level 2 | Foreign government debt securities
Assets
Fair value, assets	92	78
Level 2 | Foreign government debt securities | FES
Assets
Fair value, assets	65	58
Level 2 | U.S. government debt securities
Assets
Fair value, assets	152	161
Level 2 | U.S. government debt securities | FES
Assets
Fair value, assets	138	48
Level 2 | U.S. state debt securities
Assets
Fair value, assets	274	246
Level 2 | U.S. state debt securities | FES
Assets
Fair value, assets	21	3
Level 2 | Other
Assets
Fair value, assets	152	123
Level 2 | Other | FES
Assets
Fair value, assets	120	81
Level 3
Assets
Fair value, assets	5	8
Liabilities
Fair value, liabilities	(94)	(114)
Net assets (liabilities)	(89)	(106)
Level 3 | FES
Assets
Fair value, assets	1	4
Liabilities
Fair value, liabilities	(1)	(5)
Net assets (liabilities)	0	(1)
Level 3 | Commodity contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	0	0
Level 3 | Commodity contracts | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	0	0
Level 3 | FTRs | Derivative Liabilities
Liabilities
Fair value, liabilities	(2)	(6)
Level 3 | FTRs | Derivative Liabilities | FES
Liabilities
Fair value, liabilities	(1)	(5)
Level 3 | NUG contracts | Derivative Liabilities
Liabilities
Fair value, liabilities	(92)	(108)
Level 3 | Corporate debt securities
Assets
Fair value, assets	0	0
Level 3 | Corporate debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | Commodity contracts | Derivative Assets
Assets
Fair value, assets	0	0
Level 3 | Commodity contracts | Derivative Assets | FES
Assets
Fair value, assets	0	0
Level 3 | FTRs | Derivative Assets
Assets
Fair value, assets	5	7
Level 3 | FTRs | Derivative Assets | FES
Assets
Fair value, assets	1	4
Level 3 | NUG contracts | Derivative Assets
Assets
Fair value, assets	0	1
Level 3 | Equity securities
Assets
Fair value, assets	0	0
Level 3 | Equity securities | FES
Assets
Fair value, assets	0	0
Level 3 | Foreign government debt securities
Assets
Fair value, assets	0	0
Level 3 | Foreign government debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | U.S. government debt securities
Assets
Fair value, assets	0	0
Level 3 | U.S. government debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | U.S. state debt securities
Assets
Fair value, assets	0	0
Level 3 | U.S. state debt securities | FES
Assets
Fair value, assets	0	0
Level 3 | Other
Assets
Fair value, assets	0	0
Level 3 | Other | FES
Assets
Fair value, assets	$ 0	$ 0

X

- Definition

Fair value of assets and liabilities net.

+ References

No definition available.

+ Details

Name:	fe_FairValueOfAssetsAndLiabilitiesNet
Namespace Prefix:	fe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fe_FesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_CommodityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fe_DerivativeLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=fe_FtrsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=fe_NonUtilityGenerationContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_CommodityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fe_DerivativeAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=fe_FtrsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=fe_NonUtilityGenerationContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=fe_OtherSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: