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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Accumulated Other Comprehensive Income | The changes in AOCI, net of tax, in the three and nine months ended September 30, 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 July 1, 2017 |  | $ | (26 | ) |  | $ | 61 |  |  | $ | 128 |  |  | $ | 163 |
Other comprehensive income before reclassifications |  | — |  |  | 27 |  |  | — |  |  | 27 |
Amounts reclassified from AOCI |  | 4 |  |  | (33 | ) |  | (19 | ) |  | (48 | )
Other comprehensive income (loss) |  | 4 |  |  | (6 | ) |  | (19 | ) |  | (21 | )
Income taxes (benefits) on other comprehensive income (loss) |  | 1 |  |  | (3 | ) |  | (7 | ) |  | (9 | )
Other comprehensive income (loss), net of tax |  | 3 |  |  | (3 | ) |  | (12 | ) |  | (12 | )
AOCI Balance as of September 30, 2017 |  | $ | (23 | ) |  | $ | 58 |  |  | $ | 116 |  |  | $ | 151 |
AOCI Balance as of July 1, 2016 |  | $ | (31 | ) |  | $ | 58 |  |  | $ | 164 |  |  | $ | 191 |
Other comprehensive income before reclassifications |  | — |  |  | 21 |  |  | — |  |  | 21 |
Amounts reclassified from AOCI |  | 2 |  |  | (17 | ) |  | (18 | ) |  | (33 | )
Other comprehensive income (loss) |  | 2 |  |  | 4 |  |  | (18 | ) |  | (12 | )
Income taxes (benefits) on other comprehensive income (loss) |  | — |  |  | 2 |  |  | (7 | ) |  | (5 | )
Other comprehensive income (loss), net of tax |  | 2 |  |  | 2 |  |  | (11 | ) |  | (7 | )
AOCI Balance as of September 30, 2016 |  | $ | (29 | ) |  | $ | 60 |  |  | $ | 153 |  |  | $ | 184 |
|  | 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 |  | — |  |  | 63 |  |  | — |  |  | 63 |
Amounts reclassified from AOCI |  | 8 |  |  | (55 | ) |  | (55 | ) |  | (102 | )
Other comprehensive income (loss) |  | 8 |  |  | 8 |  |  | (55 | ) |  | (39 | )
Income taxes (benefits) on other comprehensive income (loss) |  | 3 |  |  | 2 |  |  | (21 | ) |  | (16 | )
Other comprehensive income (loss), net of tax |  | 5 |  |  | 6 |  |  | (34 | ) |  | (23 | )
AOCI Balance as of September 30, 2017 |  | $ | (23 | ) |  | $ | 58 |  |  | $ | 116 |  |  | $ | 151 |
AOCI Balance as of January 1, 2016 |  | $ | (33 | ) |  | $ | 18 |  |  | $ | 186 |  |  | $ | 171 |
Other comprehensive income before reclassifications |  | — |  |  | 109 |  |  | — |  |  | 109 |
Amounts reclassified from AOCI |  | 6 |  |  | (42 | ) |  | (54 | ) |  | (90 | )
Other comprehensive income (loss) |  | 6 |  |  | 67 |  |  | (54 | ) |  | 19 |
Income taxes (benefits) on other comprehensive income (loss) |  | 2 |  |  | 25 |  |  | (21 | ) |  | 6 |
Other comprehensive income (loss), net of tax |  | 4 |  |  | 42 |  |  | (33 | ) |  | 13 |
AOCI Balance as of September 30, 2016 |  | $ | (29 | ) |  | $ | 60 |  |  | $ | 153 |  |  | $ | 184 |
Reclassification out of Accumulated Other Comprehensive Income | The following amounts were reclassified from AOCI for FirstEnergy in the three and nine months ended September 30, 2017 and 2016:
|  | For the Three Months Ended September 30 |  | For the Nine Months Ended September 30 |  | Affected Line Item in the Consolidated Statements of Income (Loss)
Reclassifications from AOCI(2) |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
|  | (In millions) |  |
Gains & losses on cash flow hedges |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 4 |  |  | $ | 2 |  |  | $ | 8 |  |  | $ | 6 |  |  | Interest expense
|  | (1 | ) |  | — |  |  | (3 | ) |  | (2 | ) |  | Income taxes
|  | $ | 3 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 4 |  |  | Net of tax
Unrealized gains on AFS securities |  |  |  |  |  |  |  |  |  |
Realized gains on sales of securities |  | $ | (33 | ) |  | $ | (17 | ) |  | $ | (55 | ) |  | $ | (42 | ) |  | Investment income
|  | 12 |  |  | 7 |  |  | 20 |  |  | 16 |  |  | Income taxes
|  | $ | (21 | ) |  | $ | (10 | ) |  | $ | (35 | ) |  | $ | (26 | ) |  | Net of tax
Defined benefit pension and OPEB plans |  |  |  |  |  |  |  |  |  |
Prior-service costs |  | $ | (19 | ) |  | $ | (18 | ) |  | $ | (55 | ) |  | $ | (54 | ) |  | (1)
|  | 7 |  |  | 7 |  |  | 21 |  |  | 21 |  |  | Income taxes
|  | $ | (12 | ) |  | $ | (11 | ) |  | $ | (34 | ) |  | $ | (33 | ) |  | 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.
FES |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Accumulated Other Comprehensive Income | The changes in AOCI, net of tax, in the three and nine months ended September 30, 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 July 1, 2017 |  | $ | (9 | ) |  | $ | 62 |  |  | $ | 26 |  |  | $ | 79 |
Other comprehensive income before reclassifications |  | — |  |  | 27 |  |  | — |  |  | 27 |
Amounts reclassified from AOCI |  | 1 |  |  | (33 | ) |  | (3 | ) |  | (35 | )
Other comprehensive income (loss) |  | 1 |  |  | (6 | ) |  | (3 | ) |  | (8 | )
Income tax benefits on other comprehensive income (loss) |  | — |  |  | (2 | ) |  | (1 | ) |  | (3 | )
Other comprehensive income (loss), net of tax |  | 1 |  |  | (4 | ) |  | (2 | ) |  | (5 | )
AOCI Balance as of September 30, 2017 |  | $ | (8 | ) |  | $ | 58 |  |  | $ | 24 |  |  | $ | 74 |
AOCI Balance as of July 1, 2016 |  | $ | (10 | ) |  | $ | 50 |  |  | $ | 35 |  |  | $ | 75 |
Other comprehensive income before reclassifications |  | — |  |  | 22 |  |  | — |  |  | 22 |
Amounts reclassified from AOCI |  | 1 |  |  | (17 | ) |  | (3 | ) |  | (19 | )
Other comprehensive income (loss) |  | 1 |  |  | 5 |  |  | (3 | ) |  | 3 |
Income taxes (benefits) on other comprehensive income (loss) |  | — |  |  | 2 |  |  | (1 | ) |  | 1 |
Other comprehensive income (loss), net of tax |  | 1 |  |  | 3 |  |  | (2 | ) |  | 2 |
AOCI Balance as of September 30, 2016 |  | $ | (9 | ) |  | $ | 53 |  |  | $ | 33 |  |  | $ | 77 |
|  | 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 |  | — |  |  | 70 |  |  | — |  |  | 70 |
Amounts reclassified from AOCI |  | 1 |  |  | (54 | ) |  | (10 | ) |  | (63 | )
Other comprehensive income (loss) |  | 1 |  |  | 16 |  |  | (10 | ) |  | 7 |
Income taxes (benefits) on other comprehensive income (loss) |  | — |  |  | 6 |  |  | (4 | ) |  | 2 |
Other comprehensive income (loss), net of tax |  | 1 |  |  | 10 |  |  | (6 | ) |  | 5 |
AOCI Balance as of September 30, 2017 |  | $ | (8 | ) |  | $ | 58 |  |  | $ | 24 |  |  | $ | 74 |
AOCI Balance as of January 1, 2016 |  | $ | (9 | ) |  | $ | 16 |  |  | $ | 39 |  |  | $ | 46 |
Other comprehensive income before reclassifications |  | — |  |  | 102 |  |  | — |  |  | 102 |
Amounts reclassified from AOCI |  | — |  |  | (41 | ) |  | (10 | ) |  | (51 | )
Other comprehensive income (loss) |  | — |  |  | 61 |  |  | (10 | ) |  | 51 |
Income taxes (benefits) on other comprehensive income (loss) |  | — |  |  | 24 |  |  | (4 | ) |  | 20 |
Other comprehensive income (loss), net of tax |  | — |  |  | 37 |  |  | (6 | ) |  | 31 |
AOCI Balance as of September 30, 2016 |  | $ | (9 | ) |  | $ | 53 |  |  | $ | 33 |  |  | $ | 77 |
Reclassification out of Accumulated Other Comprehensive Income | The following amounts were reclassified from AOCI for FES in the three and nine months ended September 30, 2017 and 2016:
|  | For the Three Months Ended September 30 |  | For the Nine Months Ended September 30 |  | Affected Line Item in the Consolidated Statements of Income (Loss)
Reclassifications from AOCI(2) |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
|  | (In millions) |  |
Gains & losses on cash flow hedges |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | Other operating expenses
|  | — |  |  | — |  |  | — |  |  | — |  |  | Income taxes (benefits)
|  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | Net of tax
Unrealized gains on AFS securities |  |  |  |  |  |  |  |  |  |
Realized gains on sales of securities |  | $ | (33 | ) |  | $ | (17 | ) |  | $ | (54 | ) |  | $ | (41 | ) |  | Investment income
|  | 11 |  |  | 6 |  |  | 19 |  |  | 15 |  |  | Income taxes (benefits)
|  | $ | (22 | ) |  | $ | (11 | ) |  | $ | (35 | ) |  | $ | (26 | ) |  | Net of tax
Defined benefit pension and OPEB plans |  |  |  |  |  |  |  |  |  |
Prior-service costs |  | $ | (3 | ) |  | $ | (3 | ) |  | $ | (10 | ) |  | $ | (10 | ) |  | (1)
|  | 1 |  |  | 1 |  |  | 4 |  |  | 4 |  |  | Income taxes (benefits)
|  | $ | (2 | ) |  | $ | (2 | ) |  | $ | (6 | ) |  | $ | (6 | ) |  | 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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