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Accounting for Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity | The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception, as of March 31, 2019 and December 31, 2018. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.
|  | Total Volume
|  | March 31, 2019 |  | December 31, 2018
Category | Units | (In millions)
Emissions | Short Ton | 1 |  |  | (2 | )
Renewable Energy Certificates | Certificates | 1 |  |  | 1 |
Coal | Short Ton | 9 |  |  | 13 |
Natural Gas | MMBtu | (236 | ) |  | (330 | )
Oil | Barrels | — |  |  | 1 |
Power | MWh | 8 |  |  | 1 |
Capacity | MW/Day | (1 | ) |  | (1 | )
Interest | Dollars | $ | 1,000 |  |  | $ | 1,000 |
Fair value within the derivative instrument valuation on the balance sheets | The following table summarizes the fair value within the derivative instrument valuation on the balance sheets:
| Fair Value
| Derivative Assets |  | Derivative Liabilities
| March 31, 2019 |  | December 31, 2018 |  | March 31, 2019 |  | December 31, 2018
| (In millions)
Derivatives Not Designated as Cash Flow or Fair Value Hedges: |  |  |  |  |  |  |
Interest rate contracts current | $ | 15 |  |  | $ | 17 |  |  | $ | — |  |  | $ | — |
Interest rate contracts long-term | 14 |  |  | 22 |  |  | — |  |  | — |
Commodity contracts current | 596 |  |  | 747 |  |  | 489 |  |  | 673 |
Commodity contracts long-term | 333 |  |  | 295 |  |  | 350 |  |  | 304 |
Total Derivatives Not Designated as Cash Flow or Fair Value Hedges | $ | 958 |  |  | $ | 1,081 |  |  | $ | 839 |  |  | $ | 977 |
Offsetting of derivatives by counterparty assets | The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:
|  | Gross Amounts Not Offset in the March 31, 2019 Balance Sheet
|  | Gross Amounts of Recognized Assets / Liabilities |  | Derivative Instruments |  | Cash Collateral (Held) / Posted |  | Net Amount
|  | (In millions)
Commodity contracts: |  |  |  |  |  |  |  |
Derivative assets |  | $ | 929 |  |  | $ | (689 | ) |  | $ | (5 | ) |  | $ | 235 |
Derivative liabilities |  | (839 | ) |  | 689 |  |  | 92 |  |  | (58 | )
Total commodity contracts |  | 90 |  |  | — |  |  | 87 |  |  | 177 |
Interest rate contracts: |  |  |  |  |  |  |  |
Derivative assets |  | 29 |  |  | — |  |  | — |  |  | 29 |
Total interest rate contracts |  | 29 |  |  | — |  |  | — |  |  | 29 |
Total derivative instruments |  | $ | 119 |  |  | $ | — |  |  | $ | 87 |  |  | $ | 206 |
|  | Gross Amounts Not Offset in the December 31, 2018 Balance Sheet
|  | Gross Amounts of Recognized Assets / Liabilities |  | Derivative Instruments |  | Cash Collateral (Held) / Posted |  | Net Amount
|  | (In millions)
Commodity contracts: |  |  |  |  |  |  |  |
Derivative assets |  | $ | 1,042 |  |  | $ | (778 | ) |  | $ | (31 | ) |  | $ | 233 |
Derivative liabilities |  | (977 | ) |  | 778 |  |  | 114 |  |  | (85 | )
Total commodity contracts |  | 65 |  |  | — |  |  | 83 |  |  | 148 |
Interest rate contracts: |  |  |  |  |  |  |  |
Derivative assets |  | 39 |  |  | — |  |  | — |  |  | 39 |
Total interest rate contracts |  | 39 |  |  | — |  |  | — |  |  | 39 |
Total derivative instruments |  | $ | 104 |  |  | $ | — |  |  | $ | 83 |  |  | $ | 187 |
Offsetting of derivatives by counterparty, liabilities | The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:
|  | Gross Amounts Not Offset in the March 31, 2019 Balance Sheet
|  | Gross Amounts of Recognized Assets / Liabilities |  | Derivative Instruments |  | Cash Collateral (Held) / Posted |  | Net Amount
|  | (In millions)
Commodity contracts: |  |  |  |  |  |  |  |
Derivative assets |  | $ | 929 |  |  | $ | (689 | ) |  | $ | (5 | ) |  | $ | 235 |
Derivative liabilities |  | (839 | ) |  | 689 |  |  | 92 |  |  | (58 | )
Total commodity contracts |  | 90 |  |  | — |  |  | 87 |  |  | 177 |
Interest rate contracts: |  |  |  |  |  |  |  |
Derivative assets |  | 29 |  |  | — |  |  | — |  |  | 29 |
Total interest rate contracts |  | 29 |  |  | — |  |  | — |  |  | 29 |
Total derivative instruments |  | $ | 119 |  |  | $ | — |  |  | $ | 87 |  |  | $ | 206 |
|  | Gross Amounts Not Offset in the December 31, 2018 Balance Sheet
|  | Gross Amounts of Recognized Assets / Liabilities |  | Derivative Instruments |  | Cash Collateral (Held) / Posted |  | Net Amount
|  | (In millions)
Commodity contracts: |  |  |  |  |  |  |  |
Derivative assets |  | $ | 1,042 |  |  | $ | (778 | ) |  | $ | (31 | ) |  | $ | 233 |
Derivative liabilities |  | (977 | ) |  | 778 |  |  | 114 |  |  | (85 | )
Total commodity contracts |  | 65 |  |  | — |  |  | 83 |  |  | 148 |
Interest rate contracts: |  |  |  |  |  |  |  |
Derivative assets |  | 39 |  |  | — |  |  | — |  |  | 39 |
Total interest rate contracts |  | 39 |  |  | — |  |  | — |  |  | 39 |
Total derivative instruments |  | $ | 104 |  |  | $ | — |  |  | $ | 83 |  |  | $ | 187 |
Effects of ASC 815 on the Company's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax | The following table summarizes the effects on the Company's accumulated OCL balance attributable to cash flow hedge derivatives, net of tax:
| Interest Rate Contracts
| Three months ended March 31,
| 2019 |  | 2018
| (In millions)
Accumulated OCL beginning balance | $ | — |  |  | $ | (54 | )
Reclassified from accumulated OCL to income: |  |  |
Due to realization of previously deferred amounts | — |  |  | 4 |
Mark-to-market of cash flow hedge accounting contracts | — |  |  | 19 |
Accumulated OCL ending balance, net of $0, and $6 tax | $ | — |  |  | $ | (31 | )
Pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations | The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense.
| Three months ended March 31,
| 2019 |  | 2018
Unrealized mark-to-market results | (In millions)
Reversal of previously recognized unrealized losses on settled positions related to economic hedges | $ | 19 |  |  | $ | 1 |
Reversal of acquired gain positions related to economic hedges | (2 | ) |  | — |
Net unrealized gains on open positions related to economic hedges | 3 |  |  | 205 |
Total unrealized mark-to-market gains for economic hedging activities | 20 |  |  | 206 |
Reversal of previously recognized unrealized gains on settled positions related to trading activity | (6 | ) |  | (3 | )
Net unrealized gains on open positions related to trading activity | 13 |  |  | 11 |
Total unrealized mark-to-market gains for trading activity | 7 |  |  | 8 |
Total unrealized gains | $ | 27 |  |  | $ | 214 |
| Three months ended March 31,
| 2019 |  | 2018
| (In millions)
Unrealized gains/(losses) included in operating revenues | $ | 27 |  |  | $ | (88 | )
Unrealized gains included in cost of operations | — |  |  | 302 |
Total impact to statement of operations — energy commodities | $ | 27 |  |  | $ | 214 |
Total impact to statement of operations — interest rate contracts | $ | (9 | ) |  | $ | 12 |

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