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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Derivative [Line Items] |
Fair value of derivatives instruments | The following table summarizes the fair value and classification of derivative instruments on FirstEnergy’s Consolidated Balance Sheets:
Derivative Assets |  | Derivative Liabilities
| Fair Value |  |  | Fair Value
| December 31, 2016 |  | December 31, 2015 |  |  | December 31, 2016 |  | December 31, 2015
| (In millions) |  |  | (In millions)
Current Assets - Derivatives |  |  |  |  | Current Liabilities - Derivatives |  |  |
Commodity Contracts | $ | 133 |  |  | $ | 150 |  |  | Commodity Contracts | $ | (72 | ) |  | $ | (94 | )
FTRs | 7 |  |  | 7 |  |  | FTRs | (6 | ) |  | (12 | )
| 140 |  |  | 157 |  |  |  | (78 | ) |  | (106 | )
|  |  |  |  | Noncurrent Liabilities - Adverse Power Contract Liability |  |  |
Deferred Charges and Other Assets - Other |  |  |  |  | NUGs(1) | (108 | ) |  | (137 | )
Commodity Contracts | 77 |  |  | 78 |  |  | Noncurrent Liabilities - Other |  |  |
FTRs | — |  |  | 1 |  |  | Commodity Contracts | (52 | ) |  | (37 | )
NUGs(1) | 1 |  |  | 1 |  |  | FTRs | — |  |  | (1 | )
| 78 |  |  | 80 |  |  |  | (160 | ) |  | (175 | )
Derivative Assets | $ | 218 |  |  | $ | 237 |  |  | Derivative Liabilities | $ | (238 | ) |  | $ | (281 | )
(1) | NUG contracts are subject to regulatory accounting treatment and do not impact earnings.
Offsetting assets | The following tables summarize the fair value of derivative assets and derivative liabilities on FirstEnergy’s Consolidated Balance Sheets and the effect of netting arrangements and collateral on its financial position:
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2016 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 210 |  |  | $ | (117 | ) |  | $ | — |  |  | $ | 93 |
FTRs |  | 7 |  |  | (6 | ) |  | — |  |  | 1 |
NUG contracts |  | 1 |  |  | — |  |  | — |  |  | 1 |
|  | $ | 218 |  |  | $ | (123 | ) |  | $ | — |  |  | $ | 95 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (124 | ) |  | $ | 117 |  |  | $ | 1 |  |  | $ | (6 | )
FTRs |  | (6 | ) |  | 6 |  |  | — |  |  | — |
NUG contracts |  | (108 | ) |  | — |  |  | — |  |  | (108 | )
|  | $ | (238 | ) |  | $ | 123 |  |  | $ | 1 |  |  | $ | (114 | )
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2015 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 228 |  |  | $ | (125 | ) |  | $ | — |  |  | $ | 103 |
FTRs |  | 8 |  |  | (8 | ) |  | — |  |  | — |
NUG contracts |  | 1 |  |  | — |  |  | — |  |  | 1 |
|  | $ | 237 |  |  | $ | (133 | ) |  | $ | — |  |  | $ | 104 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (131 | ) |  | $ | 125 |  |  | $ | 3 |  |  | $ | (3 | )
FTRs |  | (13 | ) |  | 8 |  |  | 5 |  |  | — |
NUG contracts |  | (137 | ) |  | — |  |  | — |  |  | (137 | )
|  | $ | (281 | ) |  | $ | 133 |  |  | $ | 8 |  |  | $ | (140 | )
Offsetting liabilities | The following tables summarize the fair value of derivative assets and derivative liabilities on FirstEnergy’s Consolidated Balance Sheets and the effect of netting arrangements and collateral on its financial position:
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2016 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 210 |  |  | $ | (117 | ) |  | $ | — |  |  | $ | 93 |
FTRs |  | 7 |  |  | (6 | ) |  | — |  |  | 1 |
NUG contracts |  | 1 |  |  | — |  |  | — |  |  | 1 |
|  | $ | 218 |  |  | $ | (123 | ) |  | $ | — |  |  | $ | 95 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (124 | ) |  | $ | 117 |  |  | $ | 1 |  |  | $ | (6 | )
FTRs |  | (6 | ) |  | 6 |  |  | — |  |  | — |
NUG contracts |  | (108 | ) |  | — |  |  | — |  |  | (108 | )
|  | $ | (238 | ) |  | $ | 123 |  |  | $ | 1 |  |  | $ | (114 | )
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2015 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 228 |  |  | $ | (125 | ) |  | $ | — |  |  | $ | 103 |
FTRs |  | 8 |  |  | (8 | ) |  | — |  |  | — |
NUG contracts |  | 1 |  |  | — |  |  | — |  |  | 1 |
|  | $ | 237 |  |  | $ | (133 | ) |  | $ | — |  |  | $ | 104 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (131 | ) |  | $ | 125 |  |  | $ | 3 |  |  | $ | (3 | )
FTRs |  | (13 | ) |  | 8 |  |  | 5 |  |  | — |
NUG contracts |  | (137 | ) |  | — |  |  | — |  |  | (137 | )
|  | $ | (281 | ) |  | $ | 133 |  |  | $ | 8 |  |  | $ | (140 | )
Volume of First Energy's outstanding derivative transactions | The following table summarizes the volumes associated with FirstEnergy’s outstanding derivative transactions as of December 31, 2016:
| Purchases |  | Sales |  | Net |  | Units
| (In millions)
Power Contracts | 18 |  |  | 47 |  |  | (29 | ) |  | MWH
FTRs | 28 |  |  | — |  |  | 28 |  |  | MWH
NUGs | 3 |  |  | — |  |  | 3 |  |  | MWH
Natural Gas | 29 |  |  | 29 |  |  | — |  |  | mmBTU
The following table summarizes the volumes associated with FES' outstanding derivative transactions as of December 31, 2016:
| Purchases |  | Sales |  | Net |  | Units
| (In millions)
Power Contracts | 18 |  |  | 47 |  |  | (29 | ) |  | MWH
FTRs | 22 |  |  | — |  |  | 22 |  |  | MWH
Natural Gas | 29 |  |  | 29 |  |  | — |  |  | mmBTU
Effect of derivative instruments on statements of income and comprehensive income | The effect of active derivative instruments not in a hedging relationship on FirstEnergy's Consolidated Statements of Income (Loss) during 2016, 2015 and 2014 are summarized in the following tables:
| Year Ended December 31
| Commodity Contracts |  | FTRs |  | Total
| (In millions)
2016 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Recognized in: |  |  |  |  |  |  |  |
Other Operating Expense | $ | (14 | ) |  | $ | 5 |  |  | $ | (9 | )
Realized Gain (Loss) Reclassified to: |  |  |  |  |  |  |  |
Revenues | $ | 210 |  |  | $ | 8 |  |  | $ | 218 |
Purchased Power Expense | (131 | ) |  | — |  |  | (131 | )
Other Operating Expense | — |  |  | (35 | ) |  | (35 | )
Fuel Expense | (8 | ) |  | — |  |  | (8 | )
| Year Ended December 31
| Commodity Contracts |  | FTRs |  | Total
| (In millions)
2015 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Recognized in: |  |  |  |  |  |  |  |
Other Operating Expense | $ | 93 |  |  | $ | (20 | ) |  | $ | 73 |
Realized Gain (Loss) Reclassified to: |  |  |  |  |  |  |  |
Revenues | $ | 111 |  |  | $ | 50 |  |  | $ | 161 |
Purchased Power Expense | (130 | ) |  | — |  |  | (130 | )
Other Operating Expense | — |  |  | (49 | ) |  | (49 | )
Fuel Expense | (34 | ) |  | — |  |  | (34 | )
| Year Ended December 31
| Commodity Contracts |  | FTRs |  | Interest Rate Swaps |  | Total
| (In millions)
2014 |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Recognized in: |  |  |  |  |  |  |  |  |  |
Other Operating Expense | $ | (86 | ) |  | $ | 22 |  |  | $ | — |  |  | $ | (64 | )
Realized Gain (Loss) Reclassified to: |  |  |  |  |  |  |  |  |  |
Revenues | $ | (6 | ) |  | $ | 68 |  |  | $ | — |  |  | $ | 62 |
Purchased Power Expense | 365 |  |  | — |  |  | — |  |  | 365 |
Other Operating Expense | — |  |  | (44 | ) |  | — |  |  | (44 | )
Fuel Expense | (6 | ) |  | — |  |  | — |  |  | (6 | )
Interest Expense | — |  |  | — |  |  | 14 |  |  | 14 |
Reconciliation of changes in the fair value of certain contracts that are deferred | The following table provides a reconciliation of changes in the fair value of FirstEnergy's derivative instruments subject to regulatory accounting during 2016 and 2015. Changes in the value of these contracts are deferred for future recovery from (or credit to) customers:
|  | Year Ended December 31
Derivatives Not in a Hedging Relationship with Regulatory Offset |  | NUGs |  | Regulated FTRs |  | Total
|  | (In millions)
Outstanding net asset (liability) as of January 1, 2016 |  | $ | (136 | ) |  | $ | 1 |  |  | $ | (135 | )
Unrealized loss |  | (15 | ) |  | (3 | ) |  | (18 | )
Purchases |  | — |  |  | 4 |  |  | 4 |
Settlements |  | 44 |  |  | — |  |  | 44 |
Outstanding net asset (liability) as of December 31, 2016 |  | $ | (107 | ) |  | $ | 2 |  |  | $ | (105 | )
Outstanding net asset (liability) as of January 1, 2015 |  | $ | (151 | ) |  | $ | 11 |  |  | $ | (140 | )
Unrealized loss |  | (47 | ) |  | (9 | ) |  | (56 | )
Purchases |  | — |  |  | 12 |  |  | 12 |
Settlements |  | 62 |  |  | (13 | ) |  | 49 |
Outstanding net asset (liability) as of December 31, 2015 |  | $ | (136 | ) |  | $ | 1 |  |  | $ | (135 | )
FES |
Derivative [Line Items] |
Fair value of derivatives instruments | The following table summarizes the fair value and classification of derivative instruments on FES' Consolidated Balance Sheets:
Derivative Assets |  | Derivative Liabilities
| Fair Value |  |  | Fair Value
| December 31, 2016 |  | December 31, 2015 |  |  | December 31, 2016 |  | December 31, 2015
| (In millions) |  |  | (In millions)
Current Assets - Derivatives |  |  |  |  | Current Liabilities - Derivatives |  |  |
Commodity Contracts | $ | 133 |  |  | $ | 150 |  |  | Commodity Contracts | $ | (72 | ) |  | $ | (94 | )
FTRs | 4 |  |  | 4 |  |  | FTRs | (5 | ) |  | (10 | )
| 137 |  |  | 154 |  |  |  | (77 | ) |  | (104 | )
Deferred Charges and Other Assets - Other |  |  |  |  | Noncurrent Liabilities - Other |  |  |
Commodity Contracts | 77 |  |  | 78 |  |  | Commodity Contracts | (52 | ) |  | (37 | )
FTRs | — |  |  | 1 |  |  | FTRs | — |  |  | (1 | )
| 77 |  |  | 79 |  |  |  | (52 | ) |  | (38 | )
Derivative Assets | $ | 214 |  |  | $ | 233 |  |  | Derivative Liabilities | $ | (129 | ) |  | $ | (142 | )
Offsetting assets | The following tables summarize the fair value of derivative assets and derivative liabilities on FES’ Consolidated Balance Sheets and the effect of netting arrangements and collateral on its financial position:
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2016 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 210 |  |  | $ | (117 | ) |  | $ | — |  |  | $ | 93 |
FTRs |  | 4 |  |  | (4 | ) |  | — |  |  | — |
|  | $ | 214 |  |  | $ | (121 | ) |  | $ | — |  |  | $ | 93 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (124 | ) |  | $ | 117 |  |  | $ | 1 |  |  | $ | (6 | )
FTRs |  | (5 | ) |  | 4 |  |  | 1 |  |  | — |
|  | $ | (129 | ) |  | $ | 121 |  |  | $ | 2 |  |  | $ | (6 | )
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2015 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 228 |  |  | $ | (125 | ) |  | $ | — |  |  | $ | 103 |
FTRs |  | 5 |  |  | (5 | ) |  | — |  |  | — |
|  | $ | 233 |  |  | $ | (130 | ) |  | $ | — |  |  | $ | 103 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (131 | ) |  | $ | 125 |  |  | $ | 3 |  |  | $ | (3 | )
FTRs |  | (11 | ) |  | 5 |  |  | 6 |  |  | — |
|  | $ | (142 | ) |  | $ | 130 |  |  | $ | 9 |  |  | $ | (3 | )
Offsetting liabilities | The following tables summarize the fair value of derivative assets and derivative liabilities on FES’ Consolidated Balance Sheets and the effect of netting arrangements and collateral on its financial position:
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2016 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 210 |  |  | $ | (117 | ) |  | $ | — |  |  | $ | 93 |
FTRs |  | 4 |  |  | (4 | ) |  | — |  |  | — |
|  | $ | 214 |  |  | $ | (121 | ) |  | $ | — |  |  | $ | 93 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (124 | ) |  | $ | 117 |  |  | $ | 1 |  |  | $ | (6 | )
FTRs |  | (5 | ) |  | 4 |  |  | 1 |  |  | — |
|  | $ | (129 | ) |  | $ | 121 |  |  | $ | 2 |  |  | $ | (6 | )
|  |  |  | Amounts Not Offset in Consolidated Balance Sheet |  |
December 31, 2015 |  | Fair Value |  | Derivative Instruments |  | Cash Collateral (Received)/Pledged |  | Net Fair Value
|  | (In millions)
Derivative Assets |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 228 |  |  | $ | (125 | ) |  | $ | — |  |  | $ | 103 |
FTRs |  | 5 |  |  | (5 | ) |  | — |  |  | — |
|  | $ | 233 |  |  | $ | (130 | ) |  | $ | — |  |  | $ | 103 |
Derivative Liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (131 | ) |  | $ | 125 |  |  | $ | 3 |  |  | $ | (3 | )
FTRs |  | (11 | ) |  | 5 |  |  | 6 |  |  | — |
|  | $ | (142 | ) |  | $ | 130 |  |  | $ | 9 |  |  | $ | (3 | )
Effect of derivative instruments on statements of income and comprehensive income | The effect of active derivative instruments not in a hedging relationship on FES' Consolidated Statements of Income (Loss) during 2016, 2015 and 2014 are summarized in the following tables:
| Year Ended December 31
| Commodity Contracts |  | FTRs |  | Total
| (In millions)
2016 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Recognized in: |  |  |  |  |  |  |  |
Other Operating Expense | $ | (14 | ) |  | $ | 5 |  |  | $ | (9 | )
Realized Gain (Loss) Reclassified to: |  |  |  |  |  |  |  |
Revenues | $ | 210 |  |  | $ | 8 |  |  | $ | 218 |
Purchased Power Expense | (131 | ) |  | — |  |  | (131 | )
Other Operating Expense | — |  |  | (35 | ) |  | (35 | )
| Year Ended December 31
| Commodity Contracts |  | FTRs |  | Total
| (In millions)
2015 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Recognized in: |  |  |  |  |  |  |  |
Other Operating Expense | $ | 93 |  |  | $ | (19 | ) |  | $ | 74 |
Realized Gain (Loss) Reclassified to: |  |  |  |  |  |  |  |
Revenues | $ | 111 |  |  | $ | 49 |  |  | $ | 160 |
Purchased Power Expense | (130 | ) |  | — |  |  | (130 | )
Other Operating Expense | — |  |  | (49 | ) |  | (49 | )
| Year Ended December 31
| Commodity Contracts |  | FTRs |  | Total
| (In millions)
2014 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Recognized in: |  |  |  |  |  |  |  |
Other Operating Expense | $ | (86 | ) |  | $ | 21 |  |  | $ | (65 | )
Realized Gain (Loss) Reclassified to: |  |  |  |  |  |  |  |
Revenues | $ | (6 | ) |  | $ | 67 |  |  | $ | 61 |
Purchased Power Expense | 365 |  |  | — |  |  | 365 |
Other Operating Expense | — |  |  | (43 | ) |  | (43 | )

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