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Derivative Instruments (Tables) - Southern California Edison | 9 Months Ended
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Sep. 30, 2019
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:
|  | September 30, 2019 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Assets
(in millions) |  | Short-Term |  | Long-Term 1 |  | Subtotal |  | Short-Term 2 |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 63 |  |  | $ | 17 |  |  | $ | 80 |  |  | $ | 22 |  |  | $ | 2 |  |  | $ | 24 |  |  | $ | 56 |
Gross amounts offset in the consolidated balance sheets |  | (14 | ) |  | (2 | ) |  | (16 | ) |  | (14 | ) |  | (2 | ) |  | (16 | ) |  | — |
Cash collateral posted 3 |  | — |  |  | — |  |  | — |  |  | (8 | ) |  | — |  |  | (8 | ) |  | 8 |
Net amounts presented in the consolidated balance sheets |  | $ | 49 |  |  | $ | 15 |  |  | $ | 64 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 64 |
|  | December 31, 2018 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Assets
(in millions) |  | Short-Term |  | Long-Term 1 |  | Subtotal |  | Short-Term 2 |  | 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 3 |  | — |  |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | (7 | ) |  | 7 |
Net amounts presented in the consolidated balance sheets |  | $ | 171 |  |  | $ | 2 |  |  | $ | 173 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 167 |
1 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 3 At September 30, 2019, SCE posted $36 million of cash, of which $8 million was offset against net derivative liabilities and $28 million was reflected in "Other current assets" on the consolidated balance sheets. As December 31, 3018, SCE posted $7 million of cash, of which was offset against net derivative liabilities on the consolidated balance sheets.
Fair Value of Derivative Liabilities Instruments | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | September 30, 2019 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Assets
(in millions) |  | Short-Term |  | Long-Term 1 |  | Subtotal |  | Short-Term 2 |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 63 |  |  | $ | 17 |  |  | $ | 80 |  |  | $ | 22 |  |  | $ | 2 |  |  | $ | 24 |  |  | $ | 56 |
Gross amounts offset in the consolidated balance sheets |  | (14 | ) |  | (2 | ) |  | (16 | ) |  | (14 | ) |  | (2 | ) |  | (16 | ) |  | — |
Cash collateral posted 3 |  | — |  |  | — |  |  | — |  |  | (8 | ) |  | — |  |  | (8 | ) |  | 8 |
Net amounts presented in the consolidated balance sheets |  | $ | 49 |  |  | $ | 15 |  |  | $ | 64 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 64 |
|  | December 31, 2018 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Assets
(in millions) |  | Short-Term |  | Long-Term 1 |  | Subtotal |  | Short-Term 2 |  | 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 3 |  | — |  |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | (7 | ) |  | 7 |
Net amounts presented in the consolidated balance sheets |  | $ | 171 |  |  | $ | 2 |  |  | $ | 173 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 167 |
1 Included in "Other long-term assets" on Edison International's and SCE's consolidated balance sheets. 2 Included in "Other current liabilities" on Edison International's and SCE's consolidated balance sheets. 3 At September 30, 2019, SCE posted $36 million of cash, of which $8 million was offset against net derivative liabilities and $28 million was reflected in "Other current assets" on the consolidated balance sheets. As December 31, 3018, SCE posted $7 million of cash, of which was offset against net derivative liabilities on the consolidated balance sheets.
Summarization of Economic Hedging Activities | The following table summarizes the components of SCE's economic hedging activity:
|  | Three months ended September 30, |  | Nine months ended September 30,
(in millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Realized (losses) gains |  | $ | (47 | ) |  | $ | 23 |  |  | $ | (17 | ) |  | $ | 3 |
Unrealized gains (losses) |  | 24 |  |  | (9 | ) |  | (104 | ) |  | (35 | )
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 |  | September 30, 2019 |  | December 31, 2018
Electricity options, swaps and forwards |  | GWh |  | 5,015 |  |  | 2,786 |
Natural gas options, swaps and forwards |  | Bcf |  | 21 |  |  | 20 |
Congestion revenue rights |  | GWh |  | 54,365 |  |  | 54,453 |

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