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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Accumulated Other Comprehensive Income | The changes in AOCI, net of tax, in the three months ended March 31, 2017 and 2016, for FirstEnergy are included in the following tables:
FirstEnergy |  | Gains & Losses on Cash Flow Hedges |  | Unrealized Gains on AFS Securities |  | Defined Benefit Pension & OPEB Plans |  | Total
|  | (In millions)
AOCI Balance as of January 1, 2017 |  | $ | (28 | ) |  | $ | 52 |  |  | $ | 150 |  |  | $ | 174 |
Other comprehensive income before reclassifications |  | — |  |  | 32 |  |  | — |  |  | 32 |
Amounts reclassified from AOCI |  | 3 |  |  | (16 | ) |  | (18 | ) |  | (31 | )
Other comprehensive income (loss) |  | 3 |  |  | 16 |  |  | (18 | ) |  | 1 |
Income taxes (benefits) on other comprehensive income (loss) |  | 1 |  |  | 5 |  |  | (6 | ) |  | — |
Other comprehensive income (loss), net of tax |  | 2 |  |  | 11 |  |  | (12 | ) |  | 1 |
AOCI Balance as of March 31, 2017 |  | $ | (26 | ) |  | $ | 63 |  |  | $ | 138 |  |  | $ | 175 |
AOCI Balance as of January 1, 2016 |  | $ | (33 | ) |  | $ | 18 |  |  | $ | 186 |  |  | $ | 171 |
Other comprehensive income before reclassifications |  | — |  |  | 41 |  |  | — |  |  | 41 |
Amounts reclassified from AOCI |  | 2 |  |  | (13 | ) |  | (18 | ) |  | (29 | )
Other comprehensive income (loss) |  | 2 |  |  | 28 |  |  | (18 | ) |  | 12 |
Income taxes (benefits) on other comprehensive income (loss) |  | 1 |  |  | 10 |  |  | (7 | ) |  | 4 |
Other comprehensive income (loss), net of tax |  | 1 |  |  | 18 |  |  | (11 | ) |  | 8 |
AOCI Balance as of March 31, 2016 |  | $ | (32 | ) |  | $ | 36 |  |  | $ | 175 |  |  | $ | 179 |
Reclassification out of Accumulated Other Comprehensive Income | The following amounts were reclassified from AOCI for FirstEnergy in the three months ended March 31, 2017 and 2016:
|  | For the Three Months Ended March 31 |  | Affected Line Item in Consolidated Statements of Income
Reclassifications from AOCI(2) |  | 2017 |  | 2016 |
|  | (In millions) |  |
Gains & losses on cash flow hedges |  |  |  |  |  |
Commodity contracts |  | $ | — |  |  | $ | — |  |  | Other operating expenses
Long-term debt |  | 3 |  |  | 2 |  |  | Interest expense
|  | 3 |  |  | 2 |  |  | Total before taxes
|  | (1 | ) |  | (1 | ) |  | Income taxes
|  | $ | 2 |  |  | $ | 1 |  |  | Net of tax
Unrealized gains on AFS securities |  |  |  |  |  |
Realized gains on sales of securities |  | $ | (16 | ) |  | $ | (13 | ) |  | Investment income
|  | 6 |  |  | 5 |  |  | Income taxes
|  | $ | (10 | ) |  | $ | (8 | ) |  | Net of tax
Defined benefit pension and OPEB plans |  |  |  |  |  |
Prior-service costs |  | $ | (18 | ) |  | $ | (18 | ) |  | (1)
|  | 6 |  |  | 7 |  |  | Income taxes
|  | $ | (12 | ) |  | $ | (11 | ) |  | Net of tax
(1) These AOCI components are included in the computation of net periodic pension cost. See Note 3, Pension and Other Postemployment Benefits for additional details.
(2) Amounts in parenthesis represent credits to the Consolidated Statements of Income from AOCI.
FES |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Accumulated Other Comprehensive Income | The changes in AOCI, net of tax, in the three months ended March 31, 2017 and 2016, for FES are included in the following tables:
FES |  |  |  |  |  |  |  |
|  | Gains & Losses on Cash Flow Hedges |  | Unrealized Gains on AFS Securities |  | Defined Benefit Pension & OPEB Plans |  | Total
|  | (In millions)
AOCI Balance as of January 1, 2017 |  | $ | (9 | ) |  | $ | 48 |  |  | $ | 30 |  |  | $ | 69 |
Other comprehensive income before reclassifications |  | — |  |  | 31 |  |  | — |  |  | 31 |
Amounts reclassified from AOCI |  | — |  |  | (15 | ) |  | (3 | ) |  | (18 | )
Other comprehensive income (loss) |  | — |  |  | 16 |  |  | (3 | ) |  | 13 |
Income taxes (benefits) on other comprehensive income (loss) |  | — |  |  | 6 |  |  | (1 | ) |  | 5 |
Other comprehensive income (loss), net of tax |  | — |  |  | 10 |  |  | (2 | ) |  | 8 |
AOCI Balance as of March 31, 2017 |  | $ | (9 | ) |  | $ | 58 |  |  | $ | 28 |  |  | $ | 77 |
AOCI Balance as of January 1, 2016 |  | $ | (9 | ) |  | $ | 16 |  |  | $ | 39 |  |  | $ | 46 |
Other comprehensive income before reclassifications |  | — |  |  | 36 |  |  | — |  |  | 36 |
Amounts reclassified from AOCI |  | — |  |  | (13 | ) |  | (4 | ) |  | (17 | )
Other comprehensive income (loss) |  | — |  |  | 23 |  |  | (4 | ) |  | 19 |
Income tax (benefits) on other comprehensive income (loss) |  | — |  |  | 9 |  |  | (2 | ) |  | 7 |
Other comprehensive income (loss), net of tax |  | — |  |  | 14 |  |  | (2 | ) |  | 12 |
AOCI Balance as of March 31, 2016 |  | $ | (9 | ) |  | $ | 30 |  |  | $ | 37 |  |  | $ | 58 |
Reclassification out of Accumulated Other Comprehensive Income | The following amounts were reclassified from AOCI for FES in the three months ended March 31, 2017 and 2016:
|  | For the Three Months Ended March 31 |  | Affected Line Item in Consolidated Statements of Income (Loss)
Reclassifications from AOCI(2) |  | 2017 |  | 2016 |
|  | (In millions) |  |
Gains & losses on cash flow hedges |  |  |  |  |  |
Commodity contracts |  | $ | — |  |  | $ | — |  |  | Other operating expenses
|  | — |  |  | — |  |  | Income taxes (benefits)
|  | $ | — |  |  | $ | — |  |  | Net of tax
Unrealized gains on AFS securities |  |  |  |  |  |
Realized gains on sales of securities |  | $ | (15 | ) |  | $ | (13 | ) |  | Investment income
|  | 6 |  |  | 5 |  |  | Income taxes (benefits)
|  | $ | (9 | ) |  | $ | (8 | ) |  | Net of tax
Defined benefit pension and OPEB plans |  |  |  |  |  |
Prior-service costs |  | $ | (3 | ) |  | $ | (4 | ) |  | (1)
|  | 1 |  |  | 2 |  |  | Income taxes (benefits)
|  | $ | (2 | ) |  | $ | (2 | ) |  | Net of tax
(1) These AOCI components are included in the computation of net periodic pension cost. See Note 3, Pension and Other Postemployment Benefits for additional details.
(2) Amounts in parenthesis represent credits to the Consolidated Statements of Income (Loss) from AOCI.

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