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Pension and Other Postemployment Benefits (Details Textuals) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 13, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 01, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Mark-to-market adjustment |  | $ 194 | $ 194 | $ 369 | $ 1,243 |
Mark-to-market adjustment, net of capitalized amounts |  | 147 | $ 147 | 242 | 835 |
Decrease in mortality rate (percent) |  |  | 0.25% |  |  |
Funding contributions made for current and future years |  |  | $ 882 |  |  |
Pension contributions | $ 500 |  | 382 | 143 | 0 |
Equity contribution from parent | $ 500 | 500 |  |  |  |
Non-cash transaction: stock contribution to pension plan |  |  | 500 | 0 | 0 |
Pensions and OPEB |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Actual return (losses) on plan assets |  |  | $ 472 | $ (172) | $ 387 |
Actual return on plan assets (percent) |  |  | 8.20% | (2.70%) | 6.20% |
Expected return on plan assets |  |  | $ 429 | $ 476 | $ 496 |
Pension |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Decrease in underfunded status |  |  |  |  |  | $ 40
Company contributions |  |  | 899 | 161 |  |
Actual return (losses) on plan assets |  |  | $ 442 | $ (178) |  |
Expected long-term return on plan assets |  |  | 7.50% | 7.75% | 7.75% |
Expected return on plan assets |  |  | $ 399 | $ 443 | $ 462 |
Increase in benefit obligation due to RP2014 mortality table |  |  | 141 |  |  |
Estimated amortization of prior service costs (credits) from AOCI in next fiscal year |  |  | 8 |  |  |
Excluded from total investments |  | 16 | 16 | (7) |  |
OPEB |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Effect of plan amendment on accumulated benefit obligation |  | 13 | 13 | 10 |  |
Company contributions |  |  | 9 | 17 |  |
Actual return (losses) on plan assets |  |  | $ 30 | $ 6 |  |
Expected long-term return on plan assets |  |  | 7.50% | 7.75% | 7.75% |
Expected return on plan assets |  |  | $ 30 | $ 33 | $ 34 |
Increase in benefit obligation due to RP2014 mortality table |  |  | 8 |  |  |
Estimated amortization of prior service costs (credits) from AOCI in next fiscal year |  |  | (81) |  |  |
Excluded from total investments |  | $ (4) | (4) | (7) |  |
Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Company contributions |  |  | 382 |  |  |
FE | Pension |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Non-cash transaction: stock contribution to pension plan |  |  | 293 |  |  |
FES |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension contributions |  |  | 138 | $ 0 | 0 |
Equity contribution from parent |  |  | $ 0 |  | $ 500 |

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Net increase or decrease in the plan benefit obligation during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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