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Derivative Instruments (Tables) - Southern California Edison | 3 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Fair Value of Derivative Asset Instruments | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | March 31, 2018 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 94 |  |  | $ | 3 |  |  | $ | 97 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 93 |
Gross amounts offset in the consolidated balance sheets |  | (2 | ) |  | — |  |  | (2 | ) |  | (2 | ) |  | — |  |  | (2 | ) |  | — |
Cash collateral posted |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | 1 |
Net amounts presented in the consolidated balance sheets |  | $ | 92 |  |  | $ | 3 |  |  | $ | 95 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 94 |
|  | December 31, 2017 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 106 |  |  | $ | 5 |  |  | $ | 111 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 108 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | 1 |
Net amounts presented in the consolidated balance sheets |  | $ | 105 |  |  | $ | 5 |  |  | $ | 110 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 109 |
Fair Value of Derivative Liabilities Instruments | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | March 31, 2018 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 94 |  |  | $ | 3 |  |  | $ | 97 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 93 |
Gross amounts offset in the consolidated balance sheets |  | (2 | ) |  | — |  |  | (2 | ) |  | (2 | ) |  | — |  |  | (2 | ) |  | — |
Cash collateral posted |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | 1 |
Net amounts presented in the consolidated balance sheets |  | $ | 92 |  |  | $ | 3 |  |  | $ | 95 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 94 |
|  | December 31, 2017 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 106 |  |  | $ | 5 |  |  | $ | 111 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 108 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (1 | ) |  | 1 |
Net amounts presented in the consolidated balance sheets |  | $ | 105 |  |  | $ | 5 |  |  | $ | 110 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 109 |
Summarization of Economic Hedging Activities | The following table summarizes the components of SCE's economic hedging activity:
|  | Three months ended March 31,
(in millions) |  | 2018 |  | 2017
Realized losses |  | $ | (12 | ) |  | $ | (2 | )
Unrealized losses |  | (14 | ) |  | (85 | )
Notional Volumes of Derivative Instruments | The following table summarizes the notional volumes of derivatives used for SCE hedging activities:
|  |  |  | Economic Hedges
Commodity |  | Unit of Measure |  | March 31, 2018 |  | December 31, 2017
Electricity options, swaps and forwards |  | GWh |  | 542 |  | 475
Natural gas options, swaps and forwards |  | Bcf |  | 135 |  | 143
Congestion revenue rights |  | GWh |  | 64,830 |  | 78,765

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