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Pension and Other Postemployment Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Obligations and Funded Status |
|  | Pension |  | OPEB
Obligations and Funded Status - Qualified and Non-Qualified Plans |  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation as of January 1 |  | $ | 9,426 |  |  | $ | 9,079 |  |  | $ | 711 |  |  | $ | 724 |
Service cost |  | 208 |  |  | 191 |  |  | 5 |  |  | 5 |
Interest cost |  | 390 |  |  | 398 |  |  | 27 |  |  | 30 |
Plan participants’ contributions |  | — |  |  | — |  |  | 4 |  |  | 5 |
Plan amendments |  | 11 |  |  | — |  |  | — |  |  | (13 | )
Medicare retiree drug subsidy |  | — |  |  | — |  |  | 1 |  |  | 1 |
Actuarial loss |  | 610 |  |  | 224 |  |  | 32 |  |  | 14 |
Benefits paid |  | (478 | ) |  | (466 | ) |  | (49 | ) |  | (55 | )
Benefit obligation as of December 31 |  | $ | 10,167 |  |  | $ | 9,426 |  |  | $ | 731 |  |  | $ | 711 |
Change in fair value of plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets as of January 1 |  | $ | 6,213 |  |  | $ | 5,338 |  |  | $ | 420 |  |  | $ | 431 |
Actual return on plan assets |  | 950 |  |  | 442 |  |  | 49 |  |  | 30 |
Company contributions |  | 18 |  |  | 899 |  |  | 16 |  |  | 9 |
Plan participants’ contributions |  | — |  |  | — |  |  | 4 |  |  | 5 |
Benefits paid |  | (477 | ) |  | (466 | ) |  | (50 | ) |  | (55 | )
Fair value of plan assets as of December 31 |  | $ | 6,704 |  |  | $ | 6,213 |  |  | $ | 439 |  |  | $ | 420 |
Funded Status: |  |  |  |  |  |  |  |
Qualified plan |  | $ | (3,043 | ) |  | $ | (2,821 | ) |  |  |  |
Non-qualified plans |  | (420 | ) |  | (392 | ) |  |  |  |
Funded Status |  | $ | (3,463 | ) |  | $ | (3,213 | ) |  | $ | (292 | ) |  | $ | (291 | )
Accumulated benefit obligation |  | $ | 9,583 |  |  | $ | 8,913 |  |  | $ | — |  |  | $ | — |
Amounts Recognized on the Balance Sheet: |  |  |  |  |  |  |  |
Noncurrent assets |  | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |
Current liabilities |  | (19 | ) |  | (19 | ) |  | — |  |  | — |
Noncurrent liabilities |  | (3,444 | ) |  | (3,203 | ) |  | (292 | ) |  | (291 | )
Net liability as of December 31 |  | $ | (3,463 | ) |  | $ | (3,213 | ) |  | $ | (292 | ) |  | $ | (291 | )
Amounts Recognized in AOCI: |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | 32 |  |  | $ | 28 |  |  | $ | (206 | ) |  | $ | (288 | )
Assumptions Used to Determine Benefit Obligations |  |  |  |  |  |  |  |
(as of December 31) |  |  |  |  |  |  |  |
Discount rate |  | 3.75 | % |  | 4.25 | % |  | 3.50 | % |  | 4.00 | %
Rate of compensation increase |  | 4.20 | % |  | 4.20 | % |  | N/A |  |  | N/A |
Assumed Health Care Cost Trend Rates |  |  |  |  |  |  |  |
(as of December 31) |  |  |  |  |  |  |  |
Health care cost trend rate assumed (pre/post-Medicare) |  | N/A |  |  | N/A |  |  | 6.0-5.5% |  |  | 6.0-5.5% |
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) |  | N/A |  |  | N/A |  |  | 4.5 | % |  | 4.5 | %
Year that the rate reaches the ultimate trend rate |  | N/A |  |  | N/A |  |  | 2028 |  |  | 2027 |
Allocation of Plan Assets (as of December 31) |  |  |  |  |  |  |  |
Equity securities |  | 42 | % |  | 44 | % |  | 50 | % |  | 53 | %
Bonds |  | 32 | % |  | 30 | % |  | 33 | % |  | 41 | %
Absolute return strategies |  | 10 | % |  | 8 | % |  | — | % |  | — | %
Real estate funds |  | 9 | % |  | 10 | % |  | — | % |  | — | %
Private equity funds |  | 1 | % |  | — | % |  | — | % |  | — | %
Cash and short-term securities |  | 6 | % |  | 8 | % |  | 17 | % |  | 6 | %
Total |  | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
Components of Net Periodic Benefit Costs |
|  | Pension |  | OPEB
Components of Net Periodic Benefit Costs |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
|  | (In millions)
Service cost |  | $ | 208 |  |  | $ | 191 |  |  | $ | 193 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |
Interest cost |  | 390 |  |  | 398 |  |  | 383 |  |  | 27 |  |  | 30 |  |  | 29 |
Expected return on plan assets |  | (448 | ) |  | (399 | ) |  | (443 | ) |  | (30 | ) |  | (30 | ) |  | (33 | )
Amortization of prior service cost (credit) |  | 7 |  |  | 8 |  |  | 8 |  |  | (81 | ) |  | (80 | ) |  | (134 | )
Pension & OPEB mark-to-market adjustment |  | 108 |  |  | 179 |  |  | 344 |  |  | 13 |  |  | 15 |  |  | 25 |
Net periodic benefit cost (credit) |  | $ | 265 |  |  | $ | 377 |  |  | $ | 485 |  |  | $ | (66 | ) |  | $ | (60 | ) |  | $ | (108 | )
Assumptions Used to Determine Net Periodic Benefit Cost |
Assumptions Used to Determine Net Periodic Benefit Cost * for Years Ended December 31 |  | Pension |  | OPEB
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Weighted-average discount rate |  | 4.25 | % |  | 4.50 | % |  | 4.25 | % |  | 4.00 | % |  | 4.25 | % |  | 4.00 | %
Expected long-term return on plan assets |  | 7.50 | % |  | 7.50 | % |  | 7.75 | % |  | 7.50 | % |  | 7.50 | % |  | 7.75 | %
Rate of compensation increase |  | 4.20 | % |  | 4.20 | % |  | 4.20 | % |  | N/A |  |  | N/A |  |  | N/A |
*Excludes impact of pension and OPEB mark-to-market adjustment.
Target asset allocations for pension and OPEB portfolio | FirstEnergy’s target asset allocations for its pension and OPEB trust portfolios for 2017 and 2016 are shown in the following table:
Target Asset Allocations
Equities |  | 38 | %
Fixed income |  | 30 | %
Absolute return strategies |  | 8 | %
Real estate |  | 10 | %
Alternative investments |  | 8 | %
Cash |  | 6 | %
|  | 100 | %
Effect of One-Percentage Point change in assumed health care cost trend rates | Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects:
|  | 1-Percentage-Point Increase |  | 1-Percentage-Point Decrease
|  | (In millions)
Effect on total of service and interest cost |  | $ | 1 |  |  | $ | (1 | )
Effect on accumulated benefit obligation |  | $ | 21 |  |  | $ | (18 | )
Estimated Future Benefit Payments | Taking into account estimated employee future service, FirstEnergy expects to make the following benefit payments from plan assets and other payments, net of participant contributions:
|  |  |  | OPEB
|  | Pension |  | Benefit Payments |  | Subsidy Receipts
|  | (In millions)
2018 |  | $ | 518 |  |  | $ | 55 |  |  | $ | (1 | )
2019 |  | 531 |  |  | 54 |  |  | (1 | )
2020 |  | 552 |  |  | 53 |  |  | (1 | )
2021 |  | 567 |  |  | 53 |  |  | (1 | )
2022 |  | 581 |  |  | 52 |  |  | (1 | )
Years 2023-2027 |  | 3,056 |  |  | 241 |  |  | (3 | )
Net Pension and OPEB Asset (Liability) | FES’ share of the pension and OPEB net (liability) asset as of December 31, 2017 and 2016, was as follows:
|  | Pension |  | OPEB
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (In millions)
Net (Liability) Asset(1) |  | $ | (97 | ) |  | $ | (158 | ) |  | $ | 40 |  |  | $ | 36 |
(1) Excludes $954 million and $866 million as of December 31, 2017 and 2016, respectively, of affiliated non-current liabilities related to pension and OPEB mark-to-market costs allocated to FES of which $626 million and $570 million, respectively, are from FENOC.
Net Periodic Pension and OPEB Costs | FES’ share of the net periodic benefit cost (credit), including the pension and OPEB mark-to-market adjustment, for the three years ended December 31, 2017, was as follows:
|  | Pension |  | OPEB
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
|  | (In millions)
Net Periodic Cost (Credit) |  | $ | 60 |  |  | $ | (5 | ) |  | $ | 10 |  |  | $ | (17 | ) |  | $ | (26 | ) |  | $ | (22 | )
Pension |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Pension investments measured at fair value | The following tables set forth pension financial assets that are accounted for at fair value by level within the fair value hierarchy. See Note 10, "Fair Value Measurements," for a description of each level of the fair value hierarchy. There were no significant transfers between levels during 2017 and 2016.
|  | December 31, 2017 |  | Asset Allocation
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
|  | (In millions) |  |
Cash and short-term securities |  | $ | — |  |  | $ | 379 |  |  | $ | — |  |  | $ | 379 |  |  | 6 | %
Equity investments |  |  |  |  |  |  |  |  |  |
Domestic |  | 695 |  |  | 27 |  |  | — |  |  | 722 |  |  | 11 | %
International |  | 514 |  |  | 1,569 |  |  | — |  |  | 2,083 |  |  | 31 | %
Fixed income |  |  |  |  |  |  |  |  |  |
Government bonds |  | — |  |  | 251 |  |  | — |  |  | 251 |  |  | 4 | %
Corporate bonds |  | — |  |  | 1,237 |  |  | — |  |  | 1,237 |  |  | 18 | %
High yield debt |  | — |  |  | 689 |  |  | — |  |  | 689 |  |  | 10 | %
Mortgage-backed securities (non-government) |  | — |  |  | 31 |  |  | — |  |  | 31 |  |  | — | %
Alternatives |  |  |  |  |  |  |  |  |  |  |
Hedge funds (Absolute return) |  | — |  |  | 635 |  |  | — |  |  | 635 |  |  | 10 | %
Derivatives |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | — | %
Real estate funds |  | — |  |  | — |  |  | 631 |  |  | 631 |  |  | 9 | %
Total (1) |  | $ | 1,209 |  |  | $ | 4,817 |  |  | $ | 631 |  |  | $ | 6,657 |  |  | 99 | %
Private equity funds (2) |  |  |  |  |  |  |  | 57 |  |  | 1 | %
Total Investments |  |  |  |  |  |  |  | $ | 6,714 |  |  | 100 | %
(1) | Excludes $(10) million as of December 31, 2017, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
(2) | Net asset value used as a practical expedient to approximate fair value.
|  | December 31, 2016 |  | Asset Allocation
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
|  | (In millions) |  |
Cash and short-term securities |  | $ | — |  |  | $ | 464 |  |  | $ | — |  |  | $ | 464 |  |  | 8 | %
Equity investments |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic (1) |  | 1,048 |  |  | 13 |  |  | — |  |  | 1,061 |  |  | 17 | %
International |  | 422 |  |  | 1,269 |  |  | — |  |  | 1,691 |  |  | 27 | %
Fixed income |  |  |  |  |  |  |  |  |  |  |  |  |
Government bonds |  | — |  |  | 106 |  |  | — |  |  | 106 |  |  | 2 | %
Corporate bonds |  | — |  |  | 1,245 |  |  | — |  |  | 1,245 |  |  | 20 | %
High yield debt |  | — |  |  | 372 |  |  | — |  |  | 372 |  |  | 6 | %
Mortgage-backed securities (non-government) |  | — |  |  | 112 |  |  | — |  |  | 112 |  |  | 2 | %
Alternatives |  |  |  |  |  |  |  |  |  |  |  |  |
Hedge funds (Absolute return) |  | — |  |  | 500 |  |  | — |  |  | 500 |  |  | 8 | %
Derivatives |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | — | %
Real estate funds |  | — |  |  | — |  |  | 615 |  |  | 615 |  |  | 10 | %
Total (2) |  | $ | 1,470 |  |  | $ | 4,080 |  |  | $ | 615 |  |  | $ | 6,165 |  |  | 100 | %
Private equity funds (3) |  |  |  |  |  |  |  | 33 |  |  | — | %
Total Investments |  |  |  |  |  |  |  |  |  |  | $ | 6,198 |  |  | 100 | %
(1) | As a result of the $500 million equity contribution on December 13, 2016, there was $293 million of FE Stock included in the pension plan assets as of December 31, 2016.
(2) | Excludes $16 million as of December 31, 2016, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
(3) | Net asset value used as a practical expedient to approximate fair value.
Reconciliation of changes in the fair value of pension investments | The following table provides a reconciliation of changes in the fair value of pension investments classified as Level 3 in the fair value hierarchy during 2017 and 2016:
|  | Real Estate Funds
Balance as of January 1, 2016 |  | $ | 587 |
Actual return on plan assets: |  |  |
Unrealized gains |  | 29 |
Realized gains (losses) |  | 14 |
Transfers in |  | (15 | )
Balance as of December 31, 2016 |  | $ | 615 |
Actual return on plan assets: |  |
Unrealized gains |  | 3 |
Realized gains |  | 10 |
Transfers in (out) |  | 3 |
Balance as of December 31, 2017 |  | $ | 631 |
OPEB |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Pension investments measured at fair value | As of December 31, 2017 and 2016, the OPEB trust investments measured at fair value were as follows:
|  | December 31, 2017 |  | Asset Allocation
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
|  | (In millions) |  |
Cash and short-term securities |  | $ | — |  |  | $ | 75 |  |  | $ | — |  |  | $ | 75 |  |  | 17 | %
Equity investment |  |  |  |  |  |  |  |  |  |
Domestic |  | 220 |  |  | — |  |  | — |  |  | 220 |  |  | 50 | %
Fixed income |  |  |  |  |  |  |  |  |  |
Government bonds |  | — |  |  | 109 |  |  | — |  |  | 109 |  |  | 24 | %
Corporate bonds |  | — |  |  | 34 |  |  | — |  |  | 34 |  |  | 8 | %
Mortgage-backed securities (non-government) |  |  |  |  | 3 |  |  | — |  |  | 3 |  |  | 1 | %
Total (1) |  | $ | 220 |  |  | $ | 221 |  |  | $ | — |  |  | $ | 441 |  |  | 100 | %
(1) | Excludes $(2) million as of December 31, 2017, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
|  | December 31, 2016 |  | Asset Allocation
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
|  | (In millions) |  |
Cash and short-term securities |  | $ | — |  |  | $ | 27 |  |  | $ | — |  |  | $ | 27 |  |  | 6 | %
Equity investment |  |  |  |  |  |  |  |  |  |
Domestic |  | 223 |  |  | — |  |  | — |  |  | 223 |  |  | 53 | %
Fixed income |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | — |  |  | 40 |  |  | — |  |  | 40 |  |  | 9 | %
Government bonds |  | — |  |  | 108 |  |  | — |  |  | 108 |  |  | 26 | %
Corporate bonds |  | — |  |  | 24 |  |  | — |  |  | 24 |  |  | 6 | %
Mortgage-backed securities (non-government) |  | — |  |  | 2 |  |  | — |  |  | 2 |  |  | — | %
Total (1) |  | $ | 223 |  |  | $ | 201 |  |  | $ | — |  |  | $ | 424 |  |  | 100 | %
(1) | Excludes $(4) million as of December 31, 2016, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.

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