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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured on Recurring Basis | The following tables set forth FirstEnergy's recurring assets and liabilities that are accounted for at fair value by level within the fair value hierarchy:
| June 30, 2018 |  | December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (In millions)
Corporate debt securities | $ | — |  |  | $ | 474 |  |  | $ | — |  |  | $ | 474 |  |  | $ | — |  |  | $ | 476 |  |  | $ | — |  |  | $ | 476 |
Derivative assets - FTRs | — |  |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | — |  |  | 3 |  |  | 3 |
Equity securities(2) | 298 |  |  | — |  |  | — |  |  | 298 |  |  | 297 |  |  | — |  |  | — |  |  | 297 |
Foreign government debt securities | — |  |  | 16 |  |  | — |  |  | 16 |  |  | — |  |  | 23 |  |  | — |  |  | 23 |
U.S. government debt securities | — |  |  | 19 |  |  | — |  |  | 19 |  |  | — |  |  | 21 |  |  | — |  |  | 21 |
U.S. state debt securities | — |  |  | 248 |  |  | — |  |  | 248 |  |  | — |  |  | 247 |  |  | — |  |  | 247 |
Other(3) | 256 |  |  | 33 |  |  | — |  |  | 289 |  |  | 588 |  |  | 38 |  |  | — |  |  | 626 |
Total assets | $ | 554 |  |  | $ | 790 |  |  | $ | 5 |  |  | $ | 1,349 |  |  | $ | 885 |  |  | $ | 805 |  |  | $ | 3 |  |  | $ | 1,693 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities - commodity contracts | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (4 | ) |  | $ | — |  |  | $ | (4 | )
Derivative liabilities - FTRs | — |  |  | — |  |  | (5 | ) |  | (5 | ) |  | — |  |  | — |  |  | — |  |  | — |
Derivative liabilities - NUG contracts(1) | — |  |  | — |  |  | (65 | ) |  | (65 | ) |  | — |  |  | — |  |  | (79 | ) |  | (79 | )
Total liabilities | $ | — |  |  | $ | — |  |  | $ | (70 | ) |  | $ | (70 | ) |  | $ | — |  |  | $ | (4 | ) |  | $ | (79 | ) |  | $ | (83 | )
Net assets (liabilities)(4) | $ | 554 |  |  | $ | 790 |  |  | $ | (65 | ) |  | $ | 1,279 |  |  | $ | 885 |  |  | $ | 801 |  |  | $ | (76 | ) |  | $ | 1,610 |
(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 S&P 500 Low Volatility High Dividend Index, S&P 500 Index, MSCI World Index and MSCI AC World IMI Index.
(3) | Primarily consists of short-term cash investments.
(4) | Excludes $(12) million and $(11) million as of June 30, 2018 and December 31, 2017, 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 June 30, 2018 and December 31, 2017:
| NUG Contracts(1) |  | FTRs
| Derivative Assets |  | Derivative Liabilities |  | Net |  | Derivative Assets |  | Derivative Liabilities |  | Net
| (In millions)
January 1, 2017 Balance | $ | 1 |  |  | $ | (108 | ) |  | $ | (107 | ) |  | $ | 3 |  |  | $ | (1 | ) |  | $ | 2 |
Unrealized gain (loss) | — |  |  | (10 | ) |  | (10 | ) |  | 1 |  |  | (1 | ) |  | — |
Purchases | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Settlements | (1 | ) |  | 39 |  |  | 38 |  |  | (4 | ) |  | 2 |  |  | (2 | )
December 31, 2017 Balance | $ | — |  |  | $ | (79 | ) |  | $ | (79 | ) |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |
Unrealized gain (loss) | — |  |  | (2 | ) |  | (2 | ) |  | 1 |  |  | — |  |  | 1 |
Purchases | — |  |  | — |  |  | — |  |  | 5 |  |  | (5 | ) |  | — |
Settlements | — |  |  | 16 |  |  | 16 |  |  | (4 | ) |  | — |  |  | (4 | )
June 30, 2018 Balance | $ | — |  |  | $ | (65 | ) |  | $ | (65 | ) |  | $ | 5 |  |  | $ | (5 | ) |  | $ | — |
(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 June 30, 2018:
|  | Fair Value, Net (In millions) |  | Valuation Technique |  | Significant Input |  | Range |  | Weighted Average |  | Units
FTRs |  | $ | — |  |  | Model |  | RTO auction clearing prices |  | $(1.70) to $5.40 |  | $0.80 |  | Dollars/MWH
NUG Contracts |  | $ | (65 | ) |  | Model |  | Generation |  | 400 to 1,660,000 |  | 338,000 |  |  | MWH
|  |  | Regional electricity prices |  | $29.20 to $31.10 |  | $30.20 |  | 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, unrealized losses and fair values of investments held in NDT and nuclear fuel disposal trusts as of June 30, 2018 and December 31, 2017:
|  | June 30, 2018(1) |  | December 31, 2017(2)
|  | Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
|  | (In millions)
Debt securities |  | $ | 783 |  |  | $ | 2 |  |  | $ | (27 | ) |  | $ | 758 |  |  | $ | 774 |  |  | $ | 11 |  |  | $ | (17 | ) |  | $ | 768 |
Equity securities |  | $ | 265 |  |  | $ | 31 |  |  | $ | (1 | ) |  | $ | 295 |  |  | $ | 254 |  |  | $ | 40 |  |  | $ | — |  |  | $ | 294 |
(1) | Excludes short-term cash investments of $5 million
(2) | Excludes short-term cash investments of $11 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 equity and AFS debt securities, realized gains and losses on those sales and interest and dividend income for the three and six months ended June 30, 2018 and 2017, were as follows:
|  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (In millions)
Sale Proceeds |  | $ | 175 |  |  | $ | 313 |  |  | $ | 366 |  |  | $ | 820 |
Realized Gains |  | 9 |  |  | 29 |  |  | 28 |  |  | 50 |
Realized Losses |  | (11 | ) |  | (29 | ) |  | (27 | ) |  | (44 | )
Interest and Dividend Income |  | 10 |  |  | 10 |  |  | 20 |  |  | 19 |
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 FirstEnergy's long-term debt, which excludes capital lease obligations and net unamortized debt issuance costs, premiums and discounts as of June 30, 2018 and December 31, 2017:
| June 30, 2018 |  | December 31, 2017
| (In millions)
Carrying Value | $ | 17,650 |  |  | $ | 19,425 |
Fair Value | $ | 18,876 |  |  | $ | 21,551 |

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