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Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Fair Value of Derivative Liabilities Instruments | The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
|  | March 31, 2017 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 70 |  |  | $ | 1 |  |  | $ | 71 |  |  | $ | 238 |  |  | $ | 989 |  |  | $ | 1,227 |  |  | $ | 1,156 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 69 |  |  | $ | 1 |  |  | $ | 70 |  |  | $ | 237 |  |  | $ | 989 |  |  | $ | 1,226 |  |  | $ | 1,156 |
|  | December 31, 2016 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 74 |  |  | $ | 1 |  |  | $ | 75 |  |  | $ | 217 |  |  | $ | 941 |  |  | $ | 1,158 |  |  | $ | 1,083 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 73 |  |  | $ | 1 |  |  | $ | 74 |  |  | $ | 216 |  |  | $ | 941 |  |  | $ | 1,157 |  |  | $ | 1,083 |
1 | In addition, at March 31, 2017, there is no cash collateral posted that is not offset against derivative liabilities. At December 31, 2016, SCE received $2 million of collateral that is not offset against derivative assets and is reflected in "Other current liabilities" on the consolidated balance sheets.
Southern California Edison |
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, 2017 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 70 |  |  | $ | 1 |  |  | $ | 71 |  |  | $ | 238 |  |  | $ | 989 |  |  | $ | 1,227 |  |  | $ | 1,156 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 69 |  |  | $ | 1 |  |  | $ | 70 |  |  | $ | 237 |  |  | $ | 989 |  |  | $ | 1,226 |  |  | $ | 1,156 |
|  | December 31, 2016 |  |
|  | Derivative Assets |  | Derivative Liabilities |  | Net Liability
(in millions) |  | Short-Term |  | Long-Term |  | Subtotal |  | Short-Term |  | Long-Term |  | Subtotal |
Commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts recognized |  | $ | 74 |  |  | $ | 1 |  |  | $ | 75 |  |  | $ | 217 |  |  | $ | 941 |  |  | $ | 1,158 |  |  | $ | 1,083 |
Gross amounts offset in the consolidated balance sheets |  | (1 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |
Cash collateral posted 1 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net amounts presented in the consolidated balance sheets |  | $ | 73 |  |  | $ | 1 |  |  | $ | 74 |  |  | $ | 216 |  |  | $ | 941 |  |  | $ | 1,157 |  |  | $ | 1,083 |
1 | In addition, at March 31, 2017, there is no cash collateral posted that is not offset against derivative liabilities. At December 31, 2016, SCE received $2 million of collateral that is not offset against derivative assets and is reflected in "Other current 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 March 31,
(in millions) |  | 2017 |  | 2016
Realized losses |  | $ | (2 | ) |  | $ | (27 | )
Unrealized losses |  | (85 | ) |  | (64 | )
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, 2017 |  | December 31, 2016
Electricity options, swaps and forwards |  | GWh |  | 1,812 |  |  | 1,816
Natural gas options, swaps and forwards |  | Bcf |  | 123 |  |  | 36
Congestion revenue rights |  | GWh |  | 79,224 |  |  | 93,319
Tolling arrangements |  | GWh |  | 58,153 |  |  | 61,093

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