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Derivative Instruments (Tables) | 9 Months Ended
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Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative assets financial position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | ​ | ​
​ | ​ | Derivative Assets | ​ | Derivative Liabilities | ​ | ​ | ​
(in millions) |  | Short-Term1 |  | Long-Term2 |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |  | Net Assets
Commodity derivative contracts |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Gross amounts recognized | ​ | $ | 213 | ​ | $ | 28 | ​ | $ | 241 | ​ | $ | 8 | ​ | $ | 3 | ​ | $ | 11 | ​ | $ | 230
Gross amounts offset in the consolidated balance sheets | ​ |  | (8) | ​ |  | (3) | ​ |  | (11) | ​ |  | (8) | ​ |  | (3) | ​ |  | (11) | ​ |  | —
Cash collateral posted3 | ​ |  | (86) | ​ |  | — | ​ |  | (86) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (86)
Net amounts presented in the consolidated balance sheets | ​ | $ | 119 | ​ | $ | 25 | ​ | $ | 144 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 144
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | ​ | ​
​ | ​ | Derivative Assets | ​ | Derivative Liabilities | ​ | ​ | ​
(in millions) |  | Short-Term1 |  | Long-Term2 |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |  | Net Assets
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 posted3 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (4) | ​ |  | — | ​ |  | (4) | ​ |  | 4
Net amounts presented in the consolidated balance sheets | ​ | $ | 91 | ​ | $ | 17 | ​ | $ | 108 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 108
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 | At September 30, 2021, SCE offset $86 million of cash collateral against derivative assets , of which $76 million was reflected in "Cash" and $10 million in "Receivables" on the consolidated balance sheets. 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.
Components of Economic Hedging Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30,
(in millions) |  | ​ | 2021 | ​ | ​ | 2020 |  | 2021 | ​ | 2020
Realized gains | ​ | $ | 66 | ​ | $ | 128 | ​ | $ | 193 | ​ | $ | 68
Unrealized gains (losses) | ​ |  | 116 | ​ |  | 75 | ​ |  | 126 | ​ |  | (39)
Notional Volumes of Derivative Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unit of | ​ | Economic Hedges
Commodity |  | Measure |  | September 30, 2021 |  | December 31, 2020
Electricity options, swaps and forwards |  | GWh |  | 1,036 |  | 1,581
Natural gas options, swaps and forwards |  | Bcf |  | 50 |  | 34
Congestion revenue rights |  | GWh |  | 41,573 |  | 41,151

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