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Derivative Instruments (Tables) - SCE | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term 1 |  | Long-Term 2 |  | Subtotal |  | Short-Term 3 |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 103 |  |  | $ | 23 |  |  | $ | 126 |  |  | $ | 16 |  |  | $ | 6 |  |  | $ | 22 |  |  | $ | 104 |
Gross amounts offset in the consolidated balance sheets |  | (12) |  |  | (6) |  |  | (18) |  |  | (12) |  |  | (6) |  |  | (18) |  |  | — |
Cash collateral posted 4 |  | — |  |  | — |  |  | — |  |  | (4) |  |  | — |  |  | (4) |  |  | 4 |
Net amounts presented in the consolidated balance sheets |  | $ | 91 |  |  | $ | 17 |  |  | $ | 108 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 108 |
|  | December 31, 2019 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term 1 |  | Long-Term 2 |  | Subtotal |  | Short-Term 3 |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 94 |  |  | $ | 8 |  |  | $ | 102 |  |  | $ | 14 |  |  | $ | 2 |  |  | $ | 16 |  |  | $ | 86 |
Gross amounts offset in the consolidated balance sheets |  | (13) |  |  | (2) |  |  | (15) |  |  | (13) |  |  | (2) |  |  | (15) |  |  | — |
Cash collateral posted 4 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 81 |  |  | $ | 6 |  |  | $ | 87 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 86 |
1 Included in "Other current assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 3 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 4 At December 31, 2020, SCE posted $17 million of cash, of which $4 million was offset against derivative liabilities and $13 million was reflected in "Other current assets" on the consolidated balance sheets. At December 31, 2019, SCE posted $24 million of cash, all of which was not offset against net derivative liabilities and was reflected in "Other current assets" on the consolidated balance sheets.
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, 2020 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term 1 |  | Long-Term 2 |  | Subtotal |  | Short-Term 3 |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 103 |  |  | $ | 23 |  |  | $ | 126 |  |  | $ | 16 |  |  | $ | 6 |  |  | $ | 22 |  |  | $ | 104 |
Gross amounts offset in the consolidated balance sheets |  | (12) |  |  | (6) |  |  | (18) |  |  | (12) |  |  | (6) |  |  | (18) |  |  | — |
Cash collateral posted 4 |  | — |  |  | — |  |  | — |  |  | (4) |  |  | — |  |  | (4) |  |  | 4 |
Net amounts presented in the consolidated balance sheets |  | $ | 91 |  |  | $ | 17 |  |  | $ | 108 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 108 |
|  | December 31, 2019 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Asset
(in millions) |  | Short-Term 1 |  | Long-Term 2 |  | Subtotal |  | Short-Term 3 |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 94 |  |  | $ | 8 |  |  | $ | 102 |  |  | $ | 14 |  |  | $ | 2 |  |  | $ | 16 |  |  | $ | 86 |
Gross amounts offset in the consolidated balance sheets |  | (13) |  |  | (2) |  |  | (15) |  |  | (13) |  |  | (2) |  |  | (15) |  |  | — |
Cash collateral posted 4 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 81 |  |  | $ | 6 |  |  | $ | 87 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 86 |
1 Included in "Other current assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 3 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 4 At December 31, 2020, SCE posted $17 million of cash, of which $4 million was offset against derivative liabilities and $13 million was reflected in "Other current assets" on the consolidated balance sheets. At December 31, 2019, SCE posted $24 million of cash, all of which was not offset against net derivative liabilities and was reflected in "Other current assets" on the consolidated balance sheets.
Components of Economic Hedging Activity | The following table summarizes the components of SCE's economic hedging activity:
|  | Years ended December 31,
(in millions) |  | 2020 |  | 2019 |  | 2018
Realized gains (losses) |  | $ | 87 |  |  | $ | (7) |  |  | $ | 26 |
Unrealized gains (losses) |  | 17 |  |  | (74) |  |  | 82 |
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 | 2020 |  | 2019
Electricity options, swaps and forwards | GWh | 1,581 |  | 3,155
Natural gas options, swaps and forwards | Bcf | 34 |  | 43
Congestion revenue rights | GWh | 41,151 |  | 48,170

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