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Derivative Instruments (Tables) - SCE | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule of Derivative Liabilities in Statement of Financial Position, Fair Value | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | December 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 |  | $ | 171 |  |  | $ | 2 |  |  | $ | 173 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 13 |  |  | $ | 160 |
Gross amounts offset in the consolidated balance sheets |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Cash collateral posted |  | — |  |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | (7 | ) |  | 7 |
Net amounts presented in the consolidated balance sheets |  | $ | 171 |  |  | $ | 2 |  |  | $ | 173 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 167 |
|  | 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 |
Schedule of Derivative Assets in Statement of Financial Position, Fair Value | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | December 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 |  | $ | 171 |  |  | $ | 2 |  |  | $ | 173 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 13 |  |  | $ | 160 |
Gross amounts offset in the consolidated balance sheets |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Cash collateral posted |  | — |  |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | (7 | ) |  | 7 |
Net amounts presented in the consolidated balance sheets |  | $ | 171 |  |  | $ | 2 |  |  | $ | 173 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 167 |
|  | 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 |
Components of Economic Hedging Activity | The following table summarizes the components of SCE's economic hedging activity:
|  | Years ended December 31,
(in millions) |  | 2018 |  | 2017 |  | 2016
Realized gains (losses) |  | $ | 26 |  |  | $ | (14 | ) |  | $ | (59 | )
Unrealized gains |  | 82 |  |  | 106 |  |  | 84 |
Notional Volumes of Derivative Instruments | The following table summarizes the notional volumes of derivatives used for SCE economic hedging activities:
|  | Economic Hedges
| Unit of | December 31,
Commodity | Measure | 2018 |  | 2017
Electricity options, swaps and forwards | GWh | 2,786 |  |  | 475
Natural gas options, swaps and forwards | Bcf | 20 |  |  | 143
Congestion revenue rights | GWh | 54,453 |  |  | 78,765

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