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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value of Financial Instruments [Line Items] |
Assets and liabilities measured on recurring basis | The following tables set forth the recurring assets and liabilities that are accounted for at fair value by level within the fair value hierarchy:
FirstEnergy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring Fair Value Measurements | December 31, 2017 |  | December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (In millions)
Corporate debt securities | $ | — |  |  | $ | 1,196 |  |  | $ | — |  |  | $ | 1,196 |  |  | $ | — |  |  | $ | 1,247 |  |  | $ | — |  |  | $ | 1,247 |
Derivative assets - commodity contracts | — |  |  | 33 |  |  | — |  |  | 33 |  |  | 10 |  |  | 200 |  |  | — |  |  | 210 |
Derivative assets - FTRs | — |  |  | — |  |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 7 |  |  | 7 |
Derivative assets - NUG contracts(1) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Equity securities(2) | 1,104 |  |  | — |  |  | — |  |  | 1,104 |  |  | 925 |  |  | — |  |  | — |  |  | 925 |
Foreign government debt securities | — |  |  | 88 |  |  | — |  |  | 88 |  |  | — |  |  | 78 |  |  | — |  |  | 78 |
U.S. government debt securities | — |  |  | 154 |  |  | — |  |  | 154 |  |  | — |  |  | 161 |  |  | — |  |  | 161 |
U.S. state debt securities | — |  |  | 276 |  |  | — |  |  | 276 |  |  | — |  |  | 246 |  |  | — |  |  | 246 |
Other(3) | 589 |  |  | 135 |  |  | — |  |  | 724 |  |  | 199 |  |  | 123 |  |  | — |  |  | 322 |
Total assets | $ | 1,693 |  |  | $ | 1,882 |  |  | $ | 4 |  |  | $ | 3,579 |  |  | $ | 1,134 |  |  | $ | 2,055 |  |  | $ | 8 |  |  | $ | 3,197 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities - commodity contracts | $ | — |  |  | $ | (27 | ) |  | $ | — |  |  | $ | (27 | ) |  | $ | (6 | ) |  | $ | (118 | ) |  | $ | — |  |  | $ | (124 | )
Derivative liabilities - FTRs | — |  |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | — |  |  | (6 | ) |  | (6 | )
Derivative liabilities - NUG contracts(1) | — |  |  | — |  |  | (79 | ) |  | (79 | ) |  | — |  |  | — |  |  | (108 | ) |  | (108 | )
Total liabilities | $ | — |  |  | $ | (27 | ) |  | $ | (80 | ) |  | $ | (107 | ) |  | $ | (6 | ) |  | $ | (118 | ) |  | $ | (114 | ) |  | $ | (238 | )
Net assets (liabilities)(4) | $ | 1,693 |  |  | $ | 1,855 |  |  | $ | (76 | ) |  | $ | 3,472 |  |  | $ | 1,128 |  |  | $ | 1,937 |  |  | $ | (106 | ) |  | $ | 2,959 |
(1) | NUG contracts are subject to regulatory accounting treatment and changes in market values do not impact earnings.
(2) | NDT funds hold equity portfolios whose performance is benchmarked against the Alerian MLP Index or the Wells Fargo Hybrid and Preferred Securities REIT index.
(3) | Primarily consists of short-term cash investments.
(4) | Excludes $(8) million and $(3) million as of December 31, 2017 and December 31, 2016, respectively, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
Reconciliation of changes in the fair value roll forward of level 3 measurements of NUG contracts | The following table provides a reconciliation of changes in the fair value of NUG contracts and FTRs that are classified as Level 3 in the fair value hierarchy for the periods ended December 31, 2017 and December 31, 2016:
| NUG Contracts(1) |  | FTRs
| Derivative Assets |  | Derivative Liabilities |  | Net |  | Derivative Assets |  | Derivative Liabilities |  | Net
| (In millions)
January 1, 2016 Balance | $ | 1 |  |  | $ | (137 | ) |  | $ | (136 | ) |  | $ | 8 |  |  | $ | (13 | ) |  | $ | (5 | )
Unrealized gain (loss) | 2 |  |  | (17 | ) |  | (15 | ) |  | (6 | ) |  | (4 | ) |  | (10 | )
Purchases | — |  |  | — |  |  | — |  |  | 16 |  |  | (7 | ) |  | 9 |
Settlements | (2 | ) |  | 46 |  |  | 44 |  |  | (11 | ) |  | 18 |  |  | 7 |
December 31, 2016 Balance | $ | 1 |  |  | $ | (108 | ) |  | $ | (107 | ) |  | $ | 7 |  |  | $ | (6 | ) |  | $ | 1 |
Unrealized gain (loss) | — |  |  | (10 | ) |  | (10 | ) |  | 1 |  |  | (2 | ) |  | (1 | )
Purchases | — |  |  | — |  |  | — |  |  | 4 |  |  | (1 | ) |  | 3 |
Settlements | (1 | ) |  | 39 |  |  | 38 |  |  | (8 | ) |  | 8 |  |  | — |
December 31, 2017 Balance | $ | — |  |  | $ | (79 | ) |  | $ | (79 | ) |  | $ | 4 |  |  | $ | (1 | ) |  | $ | 3 |
(1)NUG contracts are subject to regulatory accounting treatment and changes in market values do not impact earnings.
Quantitative information for level 3 valuation | The following table provides quantitative information for FTRs and NUG contracts that are classified as Level 3 in the fair value hierarchy for the period ended December 31, 2017:
|  | Fair Value, Net (In millions) |  | Valuation Technique |  | Significant Input |  | Range |  | Weighted Average |  | Units
FTRs |  | $ | 3 |  |  | Model |  | RTO auction clearing prices |  | ($4.60) to $5.40 |  | $0.70 |  | Dollars/MWH
NUG Contracts |  | $ | (79 | ) |  | Model |  | Generation Regional electricity prices |  | 400 to 2,099,000 $30.70 to $32.00 |  | 426,000 $30.70 |  | MWH Dollars/MWH
Amortized cost basis, unrealized gains and losses and fair values of investments in available-for-sale securities | The following table summarizes the amortized cost basis, unrealized gains (there were no unrealized losses) and fair values of investments held in NDT and nuclear fuel disposal trusts as of December 31, 2017 and December 31, 2016:
|  | December 31, 2017(1) |  | December 31, 2016(2)
|  | Cost Basis |  | Unrealized Gains |  | Fair Value |  | Cost Basis |  | Unrealized Gains |  | Fair Value
|  | (In millions)
Debt securities |  |  |  |  |  |  |  |  |  |  |  |
FirstEnergy |  | $ | 1,707 |  |  | $ | 31 |  |  | $ | 1,738 |  |  | $ | 1,735 |  |  | $ | 38 |  |  | $ | 1,773 |
FES |  | 950 |  |  | 20 |  |  | 970 |  |  | 847 |  |  | 27 |  |  | 874 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
FirstEnergy |  | $ | 949 |  |  | $ | 155 |  |  | $ | 1,104 |  |  | $ | 822 |  |  | $ | 103 |  |  | $ | 925 |
FES |  | 695 |  |  | 115 |  |  | 810 |  |  | 564 |  |  | 70 |  |  | 634 |
(1) | Excludes short-term cash investments: FirstEnergy - $87 million; FES - $76 million.
(2) | Excludes short-term cash investments: FirstEnergy - $61 million; FES - $44 million.
Proceeds from the sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income | Proceeds from the sale of investments in AFS securities, realized gains and losses on those sales, OTTI and interest and dividend income for the three years ended December 31, 2017, 2016 and 2015 were as follows:
December 31, 2017 |  | Sale Proceeds |  | Realized Gains |  | Realized Losses |  | OTTI |  | Interest and Dividend Income
|  | (In millions)
FirstEnergy |  | $ | 2,170 |  |  | $ | 330 |  |  | $ | (253 | ) |  | $ | (13 | ) |  | $ | 98 |
FES |  | 940 |  |  | 256 |  |  | (195 | ) |  | (13 | ) |  | 59 |
December 31, 2016 |  | Sale Proceeds |  | Realized Gains |  | Realized Losses |  | OTTI |  | Interest and Dividend Income
|  | (In millions)
FirstEnergy |  | $ | 1,678 |  |  | $ | 170 |  |  | $ | (121 | ) |  | $ | (21 | ) |  | $ | 100 |
FES |  | 717 |  |  | 117 |  |  | (69 | ) |  | (19 | ) |  | 56 |
December 31, 2015 |  | Sale Proceeds |  | Realized Gains |  | Realized Losses |  | OTTI |  | Interest and Dividend Income
|  | (In millions)
FirstEnergy |  | $ | 1,534 |  |  | $ | 209 |  |  | $ | (191 | ) |  | $ | (102 | ) |  | $ | 101 |
FES |  | 733 |  |  | 158 |  |  | (134 | ) |  | (90 | ) |  | 57 |
Fair value and related carrying amounts of long-term debt and other long-term obligations | The following table provides the approximate fair value and related carrying amounts of long-term debt, which excludes capital lease obligations and net unamortized debt issuance costs, premiums and discounts:
| December 31, 2017 |  | December 31, 2016
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
| (In millions)
FirstEnergy | $ | 22,261 |  |  | $ | 23,038 |  |  | $ | 19,885 |  |  | $ | 19,829 |
FES | 2,836 |  |  | 1,487 |  |  | 3,000 |  |  | 1,555 |
FES |
Fair Value of Financial Instruments [Line Items] |
Assets and liabilities measured on recurring basis |
FES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring Fair Value Measurements | December 31, 2017 |  | December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (In millions)
Corporate debt securities | $ | — |  |  | $ | 720 |  |  | $ | — |  |  | $ | 720 |  |  | $ | — |  |  | $ | 726 |  |  | $ | — |  |  | $ | 726 |
Derivative assets - commodity contracts | — |  |  | 33 |  |  | — |  |  | 33 |  |  | 10 |  |  | 200 |  |  | — |  |  | 210 |
Derivative assets - FTRs | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 4 |  |  | 4 |
Equity securities(1) | 810 |  |  | — |  |  | — |  |  | 810 |  |  | 634 |  |  | — |  |  | — |  |  | 634 |
Foreign government debt securities | — |  |  | 65 |  |  | — |  |  | 65 |  |  | — |  |  | 58 |  |  | — |  |  | 58 |
U.S. government debt securities | — |  |  | 133 |  |  | — |  |  | 133 |  |  | — |  |  | 48 |  |  | — |  |  | 48 |
U.S. state debt securities | — |  |  | 29 |  |  | — |  |  | 29 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Other(2) | 1 |  |  | 96 |  |  | — |  |  | 97 |  |  | 2 |  |  | 81 |  |  | — |  |  | 83 |
Total assets | $ | 811 |  |  | $ | 1,076 |  |  | $ | 1 |  |  | $ | 1,888 |  |  | $ | 646 |  |  | $ | 1,116 |  |  | $ | 4 |  |  | $ | 1,766 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities - commodity contracts | $ | — |  |  | $ | (23 | ) |  | $ | — |  |  | $ | (23 | ) |  | $ | (6 | ) |  | $ | (118 | ) |  | $ | — |  |  | $ | (124 | )
Derivative liabilities - FTRs | — |  |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | — |  |  | (5 | ) |  | (5 | )
Total liabilities | $ | — |  |  | $ | (23 | ) |  | $ | (1 | ) |  | $ | (24 | ) |  | $ | (6 | ) |  | $ | (118 | ) |  | $ | (5 | ) |  | $ | (129 | )
Net assets (liabilities)(3) | $ | 811 |  |  | $ | 1,053 |  |  | $ | — |  |  | $ | 1,864 |  |  | $ | 640 |  |  | $ | 998 |  |  | $ | (1 | ) |  | $ | 1,637 |
(1) | NDT funds hold equity portfolios whose performance is benchmarked against the Alerian MLP Index or the Wells Fargo Hybrid and Preferred Securities REIT index.
(2) | Primarily consists of short-term cash investments.
(3) | Excludes $3 million and $2 million as of December 31, 2017 and December 31, 2016, respectively, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
Reconciliation of changes in the fair value roll forward of level 3 measurements of NUG contracts | The following table provides a reconciliation of changes in the fair value of FTRs held by FES and classified as Level 3 in the fair value hierarchy for the periods ended December 31, 2017 and December 31, 2016:
|  | Derivative Asset |  | Derivative Liability |  | Net Asset/(Liability)
|  | (In millions)
January 1, 2016 Balance |  | $ | 5 |  |  | $ | (11 | ) |  | $ | (6 | )
Unrealized loss |  | (4 | ) |  | (3 | ) |  | (7 | )
Purchases |  | 10 |  |  | (5 | ) |  | 5 |
Settlements |  | (7 | ) |  | 14 |  |  | 7 |
December 31, 2016 Balance |  | $ | 4 |  |  | $ | (5 | ) |  | $ | (1 | )
Unrealized loss |  | — |  |  | (1 | ) |  | (1 | )
Purchases |  | 1 |  |  | (1 | ) |  | — |
Settlements |  | (4 | ) |  | 6 |  |  | 2 |
December 31, 2017 Balance |  | $ | 1 |  |  | $ | (1 | ) |  | $ | — |
Quantitative information for level 3 valuation | The following table provides quantitative information for FTRs held by FES that are classified as Level 3 in the fair value hierarchy for the period ended December 31, 2017:
|  | Fair Value, Net (In millions) |  | Valuation Technique |  | Significant Input |  | Range |  | Weighted Average |  | Units
FTRs |  | $ | — |  |  | Model |  | RTO auction clearing prices |  | ($4.60) to $3.30 |  | $0.10 |  | Dollars/MWH

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- Definition Proceeds from sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income. + References No definition available. + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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