XML 83 R68.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Supplemental Guarantor Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Consolidating Statements of Income |  |  |  |  |
Revenues | [1] | $ 3,917 | $ 4,123 | $ 11,187 | $ 11,485
OPERATING EXPENSES: |  |  |  |  |
Fuel |  | 450 | 482 | 1,269 | 1,378
Purchased power |  | 979 | 1,209 | 2,992 | 3,311
Other operating expenses |  | 953 | 842 | 2,835 | 2,799
Provision for depreciation |  | 311 | 328 | 974 | 969
General taxes |  | 265 | 236 | 786 | 747
Impairment of assets |  | 0 | 8 | 1,447 | 24
Total operating expenses |  | 3,056 | 3,215 | 10,525 | 9,429
OPERATING INCOME |  | 861 | 908 | 662 | 2,056
OTHER INCOME (EXPENSE): |  |  |  |  |
Investment income, including net income (loss) from equity investees |  | 28 | (28) | 75 | (14)
Interest expense |  | (286) | (285) | (863) | (846)
Capitalized financing costs |  | 28 | 26 | 79 | 93
Total other expense |  | (230) | (287) | (709) | (767)
INCOME (LOSS) BEFORE INCOME TAXES |  | 631 | 621 | (47) | 1,289
INCOME TAXES (BENEFITS) |  | 251 | 226 | 334 | 485
NET INCOME (LOSS) |  | 380 | 395 | (381) | 804
NET INCOME (LOSS) |  | 380 | 395 | (381) | 804
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |  |
Pension and OPEB prior service costs |  | (18) | (31) | (54) | (94)
Amortized losses (gains) on derivative hedges |  | 2 | 2 | 6 | 4
Change in unrealized gains on available-for-sale securities |  | 4 | (11) | 67 | (21)
Other comprehensive income (loss) |  | (12) | (40) | 19 | (111)
Income taxes (benefits) on other comprehensive income (loss) |  | (5) | (15) | 6 | (42)
Other comprehensive income (loss), net of tax |  | (7) | (25) | 13 | (69)
COMPREHENSIVE INCOME (LOSS) |  | $ 373 | 370 | $ (368) | 735
Bruce Mansfield Unit 1 |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Percentage of undivided interest of non guarantor subsidiary |  | 93.83% |  | 93.83% |
Eliminations |  |  |  |  |
Consolidating Statements of Income |  |  |  |  |
Revenues |  | $ (859) | (906) | $ (2,593) | (2,618)
OPERATING EXPENSES: |  |  |  |  |
Fuel |  | 0 | 0 | 0 | 0
Other operating expenses |  | 11 | 12 | 37 | 36
Provision for depreciation |  | 0 | (1) | (2) | (2)
General taxes |  | 0 | 0 | 0 | 0
Impairment of assets |  |  |  | 0 | 0
Total operating expenses |  | (848) | (895) | (2,558) | (2,584)
OPERATING INCOME |  | (11) | (11) | (35) | (34)
OTHER INCOME (EXPENSE): |  |  |  |  |
Investment income, including net income (loss) from equity investees |  | (236) | (198) | (342) | (569)
Miscellaneous income |  | 0 | 0 | 0 | 0
Capitalized financing costs |  | 0 | 0 | 0 | 0
Total other expense |  | (207) | (174) | (260) | (501)
INCOME (LOSS) BEFORE INCOME TAXES |  | (218) | (185) | (295) | (535)
INCOME TAXES (BENEFITS) |  | 2 | 1 | 4 | 4
NET INCOME (LOSS) |  | (220) | (186) | (299) | (539)
NET INCOME (LOSS) |  | (220) | (186) | (299) | (539)
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |  |
Pension and OPEB prior service costs |  | 3 | 3 | 10 | 11
Amortized losses (gains) on derivative hedges |  | 0 | 0 | 0 | 0
Change in unrealized gains on available-for-sale securities |  | (5) | 11 | (60) | 20
Other comprehensive income (loss) |  | (2) | 14 | (50) | 31
Income taxes (benefits) on other comprehensive income (loss) |  | (1) | 5 | (19) | 11
Other comprehensive income (loss), net of tax |  | (1) | 9 | (31) | 20
COMPREHENSIVE INCOME (LOSS) |  | (221) | (177) | (330) | (519)
Eliminations | Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | (859) | (906) | (2,593) | (2,618)
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | 15 | 9 | 39 | 24
Eliminations | Non-Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 0 | 0 | 0 | 0
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | 14 | 15 | 43 | 44
FES |  |  |  |  |
Consolidating Statements of Income |  |  |  |  |
Revenues |  | 1,065 | 1,293 | 3,281 | 3,699
OPERATING EXPENSES: |  |  |  |  |
Fuel |  | 0 | 0 | 0 | 0
Other operating expenses |  | 95 | 34 | 218 | 300
Provision for depreciation |  | 4 | 3 | 10 | 8
General taxes |  | 8 | 10 | 23 | 36
Impairment of assets |  |  |  | 23 | 16
Total operating expenses |  | 1,304 | 1,380 | 3,991 | 4,353
OPERATING INCOME |  | (239) | (87) | (710) | (654)
OTHER INCOME (EXPENSE): |  |  |  |  |
Investment income, including net income (loss) from equity investees |  | 224 | 191 | 310 | 551
Miscellaneous income |  | 0 | 0 | 3 | 1
Capitalized financing costs |  | 0 | 0 | 0 | 0
Total other expense |  | 197 | 170 | 239 | 492
INCOME (LOSS) BEFORE INCOME TAXES |  | (42) | 83 | (471) | (162)
INCOME TAXES (BENEFITS) |  | (82) | (37) | (204) | (258)
NET INCOME (LOSS) |  | 40 | 120 | (267) | 96
NET INCOME (LOSS) |  | 40 | 120 | (267) | 96
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |  |
Pension and OPEB prior service costs |  | (3) | (4) | (10) | (12)
Amortized losses (gains) on derivative hedges |  | 1 | 0 | 0 | (2)
Change in unrealized gains on available-for-sale securities |  | 5 | (11) | 61 | (20)
Other comprehensive income (loss) |  | 3 | (15) | 51 | (34)
Income taxes (benefits) on other comprehensive income (loss) |  | 1 | (6) | 20 | (13)
Other comprehensive income (loss), net of tax |  | 2 | (9) | 31 | (21)
COMPREHENSIVE INCOME (LOSS) |  | 42 | 111 | (236) | 75
FES | Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 1,011 | 932 | 2,888 | 2,657
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (13) | (8) | (34) | (21)
FES | Non-Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 186 | 401 | 829 | 1,336
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (14) | (13) | (40) | (39)
FG |  |  |  |  |
Consolidating Statements of Income |  |  |  |  |
Revenues |  | 494 | 420 | 1,309 | 1,259
OPERATING EXPENSES: |  |  |  |  |
Fuel |  | 149 | 193 | 449 | 523
Other operating expenses |  | 61 | 66 | 220 | 208
Provision for depreciation |  | 28 | 30 | 91 | 92
General taxes |  | 7 | 8 | 23 | 23
Impairment of assets |  |  |  | 517 | 0
Total operating expenses |  | 245 | 297 | 1,300 | 846
OPERATING INCOME |  | 249 | 123 | 9 | 413
OTHER INCOME (EXPENSE): |  |  |  |  |
Investment income, including net income (loss) from equity investees |  | 8 | 4 | 21 | 12
Miscellaneous income |  | 1 | 1 | 1 | 4
Capitalized financing costs |  | 3 | 1 | 7 | 4
Total other expense |  | (18) | (22) | (57) | (64)
INCOME (LOSS) BEFORE INCOME TAXES |  | 231 | 101 | (48) | 349
INCOME TAXES (BENEFITS) |  | 87 | 36 | (1) | 131
NET INCOME (LOSS) |  | 144 | 65 | (47) | 218
NET INCOME (LOSS) |  | 144 | 65 | (47) | 218
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |  |
Pension and OPEB prior service costs |  | (3) | (3) | (10) | (11)
Amortized losses (gains) on derivative hedges |  | 0 | 0 | 0 | 0
Change in unrealized gains on available-for-sale securities |  | 0 | 0 | 0 | 0
Other comprehensive income (loss) |  | (3) | (3) | (10) | (11)
Income taxes (benefits) on other comprehensive income (loss) |  | (1) | (1) | (4) | (4)
Other comprehensive income (loss), net of tax |  | (2) | (2) | (6) | (7)
COMPREHENSIVE INCOME (LOSS) |  | 142 | 63 | (53) | 211
FG | Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 0 | 0 | 0 | 0
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (3) | (2) | (7) | (6)
FG | Non-Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 0 | 0 | 0 | 0
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (27) | (26) | (79) | (78)
NG |  |  |  |  |
Consolidating Statements of Income |  |  |  |  |
Revenues |  | 400 | 531 | 1,404 | 1,494
OPERATING EXPENSES: |  |  |  |  |
Fuel |  | 53 | 52 | 146 | 143
Other operating expenses |  | 149 | 134 | 450 | 452
Provision for depreciation |  | 51 | 47 | 151 | 142
General taxes |  | 6 | 6 | 20 | 19
Impairment of assets |  |  |  | 0 | 0
Total operating expenses |  | 298 | 316 | 912 | 967
OPERATING INCOME |  | 102 | 215 | 492 | 527
OTHER INCOME (EXPENSE): |  |  |  |  |
Investment income, including net income (loss) from equity investees |  | 28 | (18) | 67 | (1)
Miscellaneous income |  | 0 | 0 | 0 | 0
Capitalized financing costs |  | 6 | 7 | 20 | 22
Total other expense |  | 23 | (24) | 50 | (19)
INCOME (LOSS) BEFORE INCOME TAXES |  | 125 | 191 | 542 | 508
INCOME TAXES (BENEFITS) |  | 49 | 70 | 196 | 187
NET INCOME (LOSS) |  | 76 | 121 | 346 | 321
NET INCOME (LOSS) |  | 76 | 121 | 346 | 321
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |  |
Pension and OPEB prior service costs |  | 0 | 0 | 0 | 0
Amortized losses (gains) on derivative hedges |  | 0 | 0 | 0 | 0
Change in unrealized gains on available-for-sale securities |  | 5 | (11) | 60 | (20)
Other comprehensive income (loss) |  | 5 | (11) | 60 | (20)
Income taxes (benefits) on other comprehensive income (loss) |  | 2 | (4) | 23 | (7)
Other comprehensive income (loss), net of tax |  | 3 | (7) | 37 | (13)
COMPREHENSIVE INCOME (LOSS) |  | 79 | 114 | 383 | 308
NG | Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 39 | 77 | 145 | 211
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (2) | (1) | (4) | (3)
NG | Non-Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 0 | 0 | 0 | 0
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (9) | (12) | (33) | (37)
Consolidated |  |  |  |  |
Consolidating Statements of Income |  |  |  |  |
Revenues |  | 1,100 | 1,338 | 3,401 | 3,834
OPERATING EXPENSES: |  |  |  |  |
Fuel |  | 202 | 245 | 595 | 666
Other operating expenses |  | 316 | 246 | 925 | 996
Provision for depreciation |  | 83 | 79 | 250 | 240
General taxes |  | 21 | 24 | 66 | 78
Impairment of assets |  | 0 | 0 | 540 | 16
Total operating expenses |  | 999 | 1,098 | 3,645 | 3,582
OPERATING INCOME |  | 101 | 240 | (244) | 252
OTHER INCOME (EXPENSE): |  |  |  |  |
Investment income, including net income (loss) from equity investees |  | 24 | (21) | 56 | (7)
Miscellaneous income |  | 1 | 1 | 4 | 5
Capitalized financing costs |  | 9 | 8 | 27 | 26
Total other expense |  | (5) | (50) | (28) | (92)
INCOME (LOSS) BEFORE INCOME TAXES |  | 96 | 190 | (272) | 160
INCOME TAXES (BENEFITS) |  | 56 | 70 | (5) | 64
NET INCOME (LOSS) |  | 40 | 120 | (267) | 96
NET INCOME (LOSS) |  | 40 | 120 | (267) | 96
OTHER COMPREHENSIVE INCOME (LOSS): |  |  |  |  |
Pension and OPEB prior service costs |  | (3) | (4) | (10) | (12)
Amortized losses (gains) on derivative hedges |  | 1 | 0 | 0 | (2)
Change in unrealized gains on available-for-sale securities |  | 5 | (11) | 61 | (20)
Other comprehensive income (loss) |  | 3 | (15) | 51 | (34)
Income taxes (benefits) on other comprehensive income (loss) |  | 1 | (6) | 20 | (13)
Other comprehensive income (loss), net of tax |  | 2 | (9) | 31 | (21)
COMPREHENSIVE INCOME (LOSS) |  | 42 | 111 | (236) | 75
Consolidated | Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 191 | 103 | 440 | 250
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | (3) | (2) | (6) | (6)
Consolidated | Non-Affiliates |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Purchased power |  | 186 | 401 | 829 | 1,336
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest expense |  | $ (36) | $ (36) | $ (109) | $ (110)
[1] | Includes excise tax collections of $111 million and $109 million in the three months ended September 30, 2016 and 2015, respectively, and $310 million and $320 million in the nine months ended September 30, 2016 and 2015, respectively.

X
- Definition Investment, Interest and Dividend And Equity Method Investment Income (Loss) + References No definition available. + Details
Name: | fe_InvestmentInterestandDividendAndEquityMethodInvestmentIncomeLoss
Namespace Prefix: | fe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other Income Expense Abstract. + References No definition available. + Details
Name: | fe_OtherIncomeExpenseAbstract
Namespace Prefix: | fe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale Leaseback Transaction, Percentage Of Leasehold Interest Related to Sale Leaseback Arrangement + References No definition available. + Details
Name: | fe_SaleLeasebackTransactionPercentageOfLeaseholdInterestRelatedtoSaleLeasebackArrangements
Namespace Prefix: | fe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591552-111686 + Details
Name: | us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CondensedFinancialStatementsCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_CostOfPurchasedPower
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_CostsAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_FuelCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68048823&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 + Details
Name: | us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestAndDebtExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred. + References No definition available. + Details
Name: | us-gaap_InterestCostsCapitalizedAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NonoperatingIncomeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65896914&loc=d3e39076-109324 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherCostAndExpenseOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherNonoperatingIncomeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of operating expense for taxes other than income taxes of regulated operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_UtilitiesOperatingExpenseTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilityAxis=fe_BruceMansfieldUnit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fe_NonAffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_FesCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_FgcoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fe_NuclearGenerationCorpMember
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: |